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1. Integrated miRNA and transcriptome profiling to explore the molecular determinism of convergent adaptation to corn in two lepidopteran pests of agriculture

Author

Sylvie Gimenez, Imène Seninet, Marion Orsucci, Philippe Audiot, Nicolas Nègre, Kiwoong Nam, Réjane Streiff, and Emmanuelle d’Alençon

Subjects
Adaptation, Phenotypic plasticity, Genetic convergence, Regulation of gene expression, Insect plant interaction, microRNAs, Biotechnology, TP248.13-248.65, Genetics, QH426-470
Abstract

Abstract Background The degree to which adaptation to same environment is determined by similar molecular mechanisms, is a topic of broad interest in evolutionary biology, as an indicator of evolutionary predictability. We wished to address if adaptation to the same host plant in phytophagous insects involved related gene expression patterns. We compared sRNA-Seq and RNA-Seq data between two pairs of taxa of Ostrinia and Spodoptera frugiperda sharing maize as host-plant. For the latter, we had previously carried out a reciprocal transplant experiment by feeding of the larvae of the Corn strain (Sf-C) and the Rice strain (Sf-R) on corn versus rice and characterized the mRNA and miRNA responses. Results First, we predicted the genes encoding miRNA in Ostrinia nubilalis (On) and O. scapulalis (Os). Respectively 67 and 65 known miRNA genes, as well as 196 and 190 novel ones were predicted with Os genome using sncRNAs extracted from whole larvae feeding on corn or mugwort. In On, a read counts analysis showed that 37 (55.22%) known miRNAs and 19 (9.84%) novel miRNAs were differentially expressed (DE) on mugwort compared to corn (in Os, 25 known miRs (38.46%) and 8 novel ones (4.34%)). Between species on corn, 8 (12.5%) known miRNAs and 8 (6.83%) novel ones were DE while only one novel miRNA showed expression variation between species on mugwort. Gene target prediction led to the identification of 2953 unique target genes in On and 2719 in Os, among which 11.6% (344) were DE when comparing species on corn. 1.8% (54) of On miR targets showed expression variation upon a change of host-plant. We found molecular changes matching convergent phenotype, i.e., a set of nine miRNAs that are regulated either according to the host-plant both in On and Sf-C or between them on the same plant, corn. Among DE miR target genes between taxa, 13.7% shared exactly the same annotation between the two pairs of taxa and had function related to insect host-plant interaction. Conclusion There is some similarity in underlying genetic mechanisms of convergent evolution of two distant Lepidopteran species having adopted corn in their host range, highlighting possible adaptation genes.

Published
2021
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2. Complete mitogenome data from a European specimen of Ostrinia scapulalis (Walker, 1859) (Lepidoptera, Pyraloidea, Crambidae, Pyraustinae)

Author

Bernhard Gschloessl, Philippe Audiot, Sabine Nidelet, Gael J Kergoat, and Réjane Streiff

Subjects
Annotation, Assembly, Crambidae, Lepidoptera, Mitogenome, Phylogeny, Computer applications to medicine. Medical informatics, R858-859.7, Science (General), Q1-390
Abstract

We present an assembly and annotation of the mitogenome of a European specimen of the Adzuki bean borer, Ostrinia scapulalis (Walker, 1859). The data were obtained by combining WGS data issue of a de novo and a previously published sequence library (Gschloessl et al., 2018). We also provide the phylogenetic positioning of the mitogenome within the Ostrinia genus, the Crambidae family and with more distant Lepidoptera species.

Published
2020
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3. Western European Populations of the Ichneumonid Wasp Hyposoter didymator Belong to a Single Taxon

Author

Marie Frayssinet, Philippe Audiot, Antonino Cusumano, Apolline Pichon, Lisa E. Malm, Véronique Jouan, Marin Vabre, Serge Malavieille, Magalie Delalande, Enrique Vargas-Osuna, Denis Bourguet, and Anne-Nathalie Volkoff

Subjects
Hyposoter didymator, Helicoverpa amigera, population genetic structure, host preferences, western European populations, Evolution, QH359-425, Ecology, QH540-549.5
Abstract

Hyposoter didymator (Hymenoptera, Ichneumonidae) is a generalist solitary endoparasitoid of noctuid larvae. In the present work, we tested whether populations of H. didymator were divided in several genetically distinct taxa as described for many other generalist parasitoid species, and whether differences in H. didymator parasitism rates were explained by the insect host species and/or by the plant on which these hosts were feeding on. The genetic analysis of natural populations collected in different regions in France and Spain on seven different insect hosts and seven different host plants (775 individuals) showed that H. didymator populations belong to a unique single taxon. However, H. didymator seems to be somewhat specialized. Indeed, in the fields it more often parasitized Helicoverpa armigera compared to the other host species collected in the present work. Also, H. didymator parasitism rates in field conditions and semi-field experimental studies were dependent on the host plants on which H. armigera larvae are feeding. Still, H. didymator can occur occasionally on non-preferred noctuid species. One hypothesis explaining the ability of H. didymator to switch hosts in natura could be related to fluctuating densities of the preferred host over the year; this strategy would allow the parasitoid to avoid seasonal population collapses.

Published
2019
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4. Detection and Genetic Characterization of Puumala Orthohantavirus S-Segment in Areas of France Non-Endemic for Nephropathia Epidemica

Author

Séverine Murri, Sarah Madrières, Caroline Tatard, Sylvain Piry, Laure Benoit, Anne Loiseau, Julien Pradel, Emmanuelle Artige, Philippe Audiot, Nicolas Leménager, Sandra Lacôte, Johann Vulin, Nathalie Charbonnel, Philippe Marianneau, and Guillaume Castel

Subjects
Myodes glareolus, Puumala virus, diversity, molecular evolution, nephropathia epidemica, France, Medicine
Abstract

Puumala virus (PUUV) in Europe causes nephropathia epidemica (NE), a mild form of hemorrhagic fever with renal syndrome (HFRS). The incidence of NE is highly heterogeneous spatially, whereas the geographic distribution of the wild reservoir of PUUV, the bank vole, is essentially homogeneous. Our understanding of the processes driving this heterogeneity remains incomplete due to gaps in knowledge. Little is known about the current distribution and genetic variation of PUUV in the areas outside the well-identified zones of NE endemicity. We trapped bank voles in four forests in French regions in which NE is considered non-endemic, but sporadic NE cases have been reported recently. We tested bank voles for anti-PUUV IgG and characterized the S segment sequences of PUUV from seropositive animals. Phylogenetic analyses revealed specific amino-acid signatures and genetic differences between PUUV circulating in non-endemic and nearby NE-endemic areas. We also showed, in temporal surveys, that the amino-acid sequences of PUUV had undergone fewer recent changes in areas non-endemic for NE than in endemic areas. The evolutionary history of the current French PUUV clusters was investigated by phylogeographic approaches, and the results were considered in the context of the history of French forests. Our findings highlight the need to monitor the circulation and genetics of PUUV in a larger array of bank vole populations, to improve our understanding of the risk of NE.

Published
2020
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5. When history repeats itself: exploring the genetic architecture of host-plant adaptation in two closely related lepidopteran species.

Author

Hermine Alexandre, Sergine Ponsard, Denis Bourguet, Renaud Vitalis, Philippe Audiot, Sandrine Cros-Arteil, and Réjane Streiff

Subjects
Medicine, Science
Abstract

The genus Ostrinia includes two allopatric maize pests across Eurasia, namely the European corn borer (ECB, O. nubilalis) and the Asian corn borer (ACB, O. furnacalis). A third species, the Adzuki bean borer (ABB, O. scapulalis), occurs in sympatry with both the ECB and the ACB. The ABB mostly feeds on native dicots, which probably correspond to the ancestral host plant type for the genus Ostrinia. This situation offers the opportunity to characterize the two presumably independent adaptations or preadaptations to maize that occurred in the ECB and ACB. In the present study, we aimed at deciphering the genetic architecture of these two adaptations to maize, a monocot host plant recently introduced into Eurasia. To this end, we performed a genome scan analysis based on 684 AFLP markers in 12 populations of ECB, ACB and ABB. We detected 2 outlier AFLP loci when comparing French populations of the ECB and ABB, and 9 outliers when comparing Chinese populations of the ACB and ABB. These outliers were different in both countries, and we found no evidence of linkage disequilibrium between any two of them. These results suggest that adaptation or preadaptation to maize relies on a different genetic architecture in the ECB and ACB. However, this conclusion must be considered in light of the constraints inherent to genome scan approaches and of the intricate evolution of adaptation and reproductive isolation in the Ostrinia spp. complex.

Published
2013
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6. Assortative mating between European corn borer pheromone races: beyond assortative meeting.

Author

Laurent Pélozuelo, Serge Meusnier, Philippe Audiot, Denis Bourguet, and Sergine Ponsard

Subjects
Medicine, Science
Abstract

BACKGROUND: Sex pheromone communication systems may be a major force driving moth speciation by causing behavioral reproductive isolation via assortative meeting of conspecific individuals. The 'E' and 'Z' pheromone races of the European corn borer (ECB) are a textbook example in this respect. 'Z' females produce and 'Z' males preferentially respond to a 'Z' pheromone blend, while the 'E' race communicates via an 'E' blend. Both races do not freely hybridize in nature and their populations are genetically differentiated. A straightforward explanation would be that their reproductive isolation is a mere consequence of "assortative meeting" resulting from their different pheromones specifically attracting males towards same-race females at long range. However, previous laboratory experiments and those performed here show that even when moths are paired in a small box - i.e., when the meeting between sexual partners is forced - inter-race couples still have a lower mating success than intra-race ones. Hence, either the difference in attractivity of E vs. Z pheromones for males of either race still holds at short distance or the reproductive isolation between E and Z moths may not only be favoured by assortative meeting, but must also result from an additional mechanism ensuring significant assortative mating at close range. Here, we test whether this close-range mechanism is linked to the E/Z female sex pheromone communication system. METHODOLOGY/PRINCIPAL FINDINGS: Using crosses and backcrosses of E and Z strains, we found no difference in mating success between full-sisters emitting different sex pheromones. Conversely, the mating success of females with identical pheromone types but different coefficients of relatedness to the two parental strains was significantly different, and was higher when their genetic background was closer to that of their male partner's pheromone race. CONCLUSIONS/SIGNIFICANCE: We conclude that the close-range mechanism ensuring assortative mating between the E and Z ECB pheromone races is unrelated to the difference in female sex pheromone. Although the nature of this mechanism remains elusive, our results show that it is expressed in females, acts at close range, segregates independently of the autosome carrying Pher and of both sex chromosomes, and is widely distributed since it occurs both in France and in the USA.

Published
2007
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7. Transcriptional differences between the two host strains of Spodoptera frugiperda (Lepidoptera: Noctuidae)

Author

Marion Orsucci, Yves Moné, Philippe Audiot, Sylvie Gimenez, Sandra Nhim, Rima Naït-Saïdi, Marie Frayssinet, Guillaume Dumont, Jean-Paul Boudon, Marin Vabre, Stéphanie Rialle, Rachid Koual, Gael J. Kergoat, Rodney N. Nagoshi, Robert L. Meagher, Emmanuelle d’Alençon, Nicolas Nègre, Centre de Biologie pour la Gestion des Populations (UMR CBGP), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro Montpellier, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Université de Montpellier (UM), Diversité, Génomes & Interactions Microorganismes - Insectes [Montpellier] (DGIMI), Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université de Montpellier (UM), Plant Biology, Linnean Centre for Plant Biology, Uppsala BioCentre, Swedish University of Agricultural Sciences (SLU), Drexel University College of Medicine, DIASCOPE, Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Institut de Génomique Fonctionnelle - Montpellier GenomiX (IGF MGX), Institut de Génomique Fonctionnelle (IGF), Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-BioCampus (BCM), Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), USDA/ARS, and USDA-ARS : Agricultural Research Service

Subjects
[SDV]Life Sciences [q-bio]
Abstract

International audience; Spodoptera frugiperda, the fall armyworm (FAW), is an important agricultural pest in the Americas and an emerging pest in sub-Saharan Africa, India, East-Asia and Australia, causing damage to major crops such as corn, sorghum and soybean. While FAW larvae are considered polyphagous, differences in diet preference have been described between two genetic variants: the corn strain (sf-C) and the rice strain (sf-R). These two strains are sometimes considered as distinct species, raising the hypothesis that host plant specialization might have driven their divergence. To test this hypothesis, we first performed controlled reciprocal transplant (RT) experiments to address the impact of plant diet on several traits linked to the fitness of the sf-C and sf-R strains. The phenotypical data suggest that sf-C is specialized to corn. We then used RNA-Se to identify constitutive transcriptional differences between strains, regardless of diet, in laboratory as well as in natural populations. We found that variations in mitochondrial transcription levels are among the most substantial and consistent differences between the two strains. Since mitochondrial genotypes also vary between the strains, we believe the mitochondria may have a significant role in driving strain divergence.

Published
2022
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8. De novo genome and transcriptome resources of the Adzuki bean borer Ostrinia scapulalis (Lepidoptera: Crambidae)

Author

A. Bretaudeau, Carole Kerdelhué, Franck Dorkeld, Philippe Audiot, Réjane Streiff, Bernhard Gschloessl, Centre de Biologie pour la Gestion des Populations (UMR CBGP), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Université de Montpellier (UM), Institut de Génétique, Environnement et Protection des Plantes (IGEPP), Institut National de la Recherche Agronomique (INRA)-Université de Rennes (UR)-AGROCAMPUS OUEST, Plateforme bioinformatique GenOuest [Rennes], Université de Rennes (UR)-Plateforme Génomique Santé Biogenouest®-Inria Rennes – Bretagne Atlantique, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-GESTION DES DONNÉES ET DE LA CONNAISSANCE (IRISA-D7), Institut de Recherche en Informatique et Systèmes Aléatoires (IRISA), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Bretagne Sud (UBS)-École normale supérieure - Rennes (ENS Rennes)-Institut National de Recherche en Informatique et en Automatique (Inria)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Institut de Recherche en Informatique et Systèmes Aléatoires (IRISA), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Bretagne Sud (UBS)-École normale supérieure - Rennes (ENS Rennes)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), INRA (AIP Bioressources 2011) [SCOOP, INRA], Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Institut National de la Recherche Agronomique (INRA)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-AGROCAMPUS OUEST, Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Plateforme Génomique Santé Biogenouest®-Inria Rennes – Bretagne Atlantique, Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Université de Bretagne Sud (UBS)-École normale supérieure - Rennes (ENS Rennes)-Institut National de Recherche en Informatique et en Automatique (Inria)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Université de Rennes 1 (UR1), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Université de Bretagne Sud (UBS)-École normale supérieure - Rennes (ENS Rennes)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Université de Bretagne Sud (UBS)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National de Recherche en Informatique et en Automatique (Inria)-École normale supérieure - Rennes (ENS Rennes)-Centre National de la Recherche Scientifique (CNRS)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-CentraleSupélec-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Université de Bretagne Sud (UBS)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-École normale supérieure - Rennes (ENS Rennes)-Centre National de la Recherche Scientifique (CNRS)-CentraleSupélec-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), and Gschloessl, Bernhard

Subjects
0301 basic medicine, Gene prediction, Sequence assembly, Computational biology, De novo assembly, Genome, Transcriptome, Lepidoptera, Crambidae, lcsh:Computer applications to medicine. Medical informatics, Ostrinia, 03 medical and health sciences, Invertebrate Zoology, lcsh:Science (General), Gene, Genetics, Genomics and Molecular Biology, Multidisciplinary, biology, biology.organism_classification, Zoologie des invertébrés, [SDV.BA.ZI]Life Sciences [q-bio]/Animal biology/Invertebrate Zoology, 030104 developmental biology, lcsh:R858-859.7, GC-content, lcsh:Q1-390
Abstract

We present a draft genome assembly with a de novo prediction and automated functional annotation of coding genes, and a reference transcriptome of the Adzuki bean borer, Ostrinia scapulalis, based on RNA sequencing of various tissues and developmental stages. The genome assembly spans 419 Mb, has a GC content of 37.4% and includes 26,120 predicted coding genes. The reference transcriptome holds 33,080 unigenes and contains a high proportion of a set of genes conserved in eukaryotes and arthropods, used as quality assessment of the reconstructed transcripts. The new genomic and transcriptomic data presented here significantly enrich the public sequence databases for the Crambidae and Lepidoptera, and represent useful resources for future researches related to the evolution and the adaptation of phytophagous moths. The genome and transcriptome assemblies have been deposited and made accessible via a NCBI BioProject (id PRJNA390510) and the LepidoDB database (http://bipaa.genouest.org/sp/ostrinia_scapulalis/). Keywords: De novo assembly, Genome, Transcriptome, Gene prediction, Lepidoptera, Crambidae

Published
2018
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9. Transcriptional differences between the two host strains of Spodoptera frugiperda (Lepidoptera: Noctuidae)

Author

Stéphanie Rialle, Philippe Audiot, Marion Orsucci, Marie Frayssinet, Gael J. Kergoat, Robert L. Meagher, Rima Nait-Saidi, Rachid Koual, Yves Moné, Marin Vabre, Sylvie Gimenez, Jean-Paul Boudon, Sandra Nhim, Emmanuelle d'Alençon, Nicolas Nègre, Guillaume Dumont, and Rodney N. Nagoshi

Subjects
0106 biological sciences, 2. Zero hunger, Genetics, 0303 health sciences, Larva, Host (biology), Strain (biology), fungi, food and beverages, Biology, Spodoptera, biology.organism_classification, 010603 evolutionary biology, 01 natural sciences, Lepidoptera genitalia, 03 medical and health sciences, Genotype, Noctuidae, PEST analysis, 030304 developmental biology
Abstract

Spodoptera frugiperda, the fall armyworm (FAW), is an important agricultural pest in the Americas and an emerging pest in sub-Saharan Africa, India, East-Asia and Australia, causing damage to major crops such as corn, sorghum and soybean. While FAW larvae are considered polyphagous, differences in diet preference have been described between two genetic variants: the corn strain (sf-C) and the rice strain (sf-R). These two strains are sometimes considered as distinct species, raising the hypothesis that ost plant specialization might have driven their divergence. To test this hypothesis, we irst performed controlled reciprocal transplant (RT) experiments to address the impact of plant diet on several traits linked to the fitness of the sf-C and sf-R strains. The phenotypical data suggest that sf-C is specialized to corn. We then used RNA-Se to identify constitutive transcriptional differences between strains, regardless of diet, in laboratory as well as in natural populations. We found that variations in mitochon rial transcription levels are among the most substantial and consistent differences between the two strains. Since mitochondrial genotypes also vary between the strains, we believe the mitochondria may have a significant role in driving strain divergence.

Published
2018
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10. Transcriptomic response to host and non-host plants during oviposition in two closely related moth species

Author

Nidelet S, Marion Orsucci, Dany Severac, Arnaud Pommier, B Gschloessl, Marine Rohmer, Marin Vabre, Dorkeld F, Philippe Audiot, and Réjane Streiff

Subjects
Genetics, Transcriptome, European corn borer, Retrovirus, biology, Host (biology), fungi, Gene expression, RNA, biology.organism_classification, Gene, Ostrinia
Abstract

We present here a comprehensive analysis of the transcriptomic response to plant environments in ovipositing females of two sibling species of phytophagous moths affiliated to different host ranges: the European corn borer (ECB) and the adzuki bean borer (ABB). We first assembled and annotated a de novo reference transcriptome based on a high throughput RNA sequencing of females placed in different plant environments, then we measured differences in gene expression between ECB and ABB, and also within each moth species between environments. We further related the differentially expressed (DE) genes to the host preference in ECB and ABB and highlighted the functional categories involved. More specifically, we conducted an analysis on chemosensory genes previously characterized in ECB, ABB and other related Ostrinia species, as these genes are considered as good candidates for the host recognition before oviposition.Overall, we recorded more DE genes in ECB than in ABB samples, what could highlight the higher strength of the host specialization in ECB compared to ABB as observed at the behavioral level. We also noticed that the genes involved in the preference for their respective host were different between ECB and ABB. At the functional level, the response to plant environment in ECB and ABB during oviposition involved many processes, including the chemosensory repertoire as expected, but also metabolism of carbohydrates, lipids, proteins, and amino acids, detoxification mechanisms and immunity.All together, our results allowed identifying genes and functions candidates for specialization and also for the species divergence between ECB and ABB. By ad-hoc categorization, we discriminated some genes responding to the environment with similar or divergent pattern in ECB and ABB. Among them, we highlighted new lines of research like carbohydrates metabolism or virus and retrovirus dynamics.

Published
2018
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11. ‘Becoming a species by becoming a pest’ or how two maize pests of the genusOstriniapossibly evolved through parallel ecological speciation events

Author

Zhen-ying Wang, Jing Li, Sergine Ponsard, Denis Bourguet, Serge Meusnier, Philippe Audiot, Réjane Streiff, Centre de Biologie pour la Gestion des Populations (UMR CBGP), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Université de Montpellier (UM)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro - Montpellier SupAgro, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Evolution et Diversité Biologique (EDB), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), State Key Laboratory for Biology of Plant Diseases and Insect Pests, Chinese Academy of Agricultural Sciences (CAAS), Diversité, Génomes & Interactions Microorganismes - Insectes [Montpellier] (DGIMI), Institut National de la Recherche Agronomique (INRA)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Actions Ponctuelles de Cooperation, Conge pour Recherches ou Conversion Thematique of Toulouse University, Agricultural Academy of Sciences in Beijing, ANR-08-STRA-0005,BIOCOSMAC,Macrocentrus cingulum comme agent de lutte biologique contre Ostrinia sp.(2008), ANR-11-IDEX-0002,UNITI,Université Fédérale de Toulouse(2011), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), State Key Laboratory for the Biology of the Plant Diseases and Insect Pests, Institute of Plant Protection, China Academy of Chinese Medicinal Sciences, Université de Montpellier (UM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de la Recherche Agronomique (INRA), ANR project BIOCOSMAC [ANR-08-STRA-05-02], project TULIP [ANR-10-LABX-41], Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), and Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées

Subjects
Male, [SDV.SA]Life Sciences [q-bio]/Agricultural sciences, Sympatry, adzuki bean borer, European corn borer, ostrinia, population-structure, Ostrinia nubilalis, Genes, Insect, mitochondrial DNA, Moths, maize, microsatellites, Ostrinia, Gene flow, furnacalis, ecological speciation, Cluster Analysis, f-statistics, phylogenetic-relationships, [SDV.BDD]Life Sciences [q-bio]/Development Biology, biology, Ecology, [SDV.BA]Life Sciences [q-bio]/Animal biology, Ostrinia furnacalis, differentiation, Reproductive isolation, Europe, ravageur de culture, european corn-borer, pyrale du mais, Gene Flow, nubilalis hubner, China, Reproductive Isolation, Genotype, Genetic Speciation, maïs, flux de gènes, french populations, DNA, Mitochondrial, Zea mays, Ecological speciation, sex-pheromone, Genetics, Animals, Crosses, Genetic, Ecology, Evolution, Behavior and Systematics, Hybrid, chine, Models, Genetic, Ostrinia scapulalis, Chimera, Bayes Theorem, Sequence Analysis, DNA, spéciation écologique, biology.organism_classification, sympatric host races, sibérie orientale, Rhopalocera, lepidoptera, genetic, Microsatellite Repeats
Abstract

New agricultural pest species attacking introduced crops may evolve from pre-existing local herbivores by ecological speciation, thereby becoming a species by becoming a pest. We compare the evolutionary pathways by which two maize pests (the Asian and the European corn borers, ACB and ECB) in the genus Ostrinia (Lepidoptera, Crambidae) probably diverged from an ancestral species close to the current Adzuki bean borer (ABB). We typed larval Ostrinia populations collected on maize and dicotyledons across China and eastern Siberia, at microsatellite and mitochondrial loci. We found only two clusters: one on maize (as expected) and a single one on dicotyledons despite differences in male mid-tibia morphology, suggesting that all individuals from dicotyledons belonged to the ABB. We found evidence for migrants and hybrids on both host plant types. Hybrids suggest that field reproductive isolation is incomplete between ACB and ABB. Interestingly, a few individuals with an 'ABB-like' microsatellite profile collected on dicotyledons had 'ACB' mtDNA rather than 'ABB-like' mtDNA, whereas the reverse was never found on maize. This suggests asymmetrical gene flow directed from the ACB towards the ABB. Hybrids and backcrosses in all directions were obtained in no-choice tests. In laboratory conditions, they survived as well as parental strain individuals. In Xinjiang, we found ACB and ECB in sympatry, but no hybrids. Altogether, our results suggest that reproductive isolation between ACB and ABB is incomplete and mostly prezygotic. This points to ecological speciation as a possible evolutionary scenario, as previously found for ECB and ABB in Europe.

Published
2014
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12. Parallel evolution of behaviour during independent host-shifts following maize introduction into Asia and Europe

Author

Vincent, Calcagno, Clémentine, Mitoyen, Philippe, Audiot, Sergine, Ponsard, Gui-Zhen, Gao, Zhao-Zhi, Lu, Zhen-Ying, Wang, Kang-Lai, He, and Denis, Bourguet

Subjects
parallel evolution, harvest selection, Ostrinia spp, geotaxis, Original Article, Original Articles, agricultural pests, host‐shift, behavioural adaptation
Abstract

Maize was introduced into opposite sides of Eurasia 500 years ago, in Western Europe and in Asia. This caused two host‐shifts in the phytophagous genus Ostrinia; O. nubilalis (the European corn borer; ECB) and O. furnacalis (the Asian corn borer; ACB) are now major pests of maize worldwide. They originated independently from Dicot‐feeding ancestors, similar to O. scapulalis (the Adzuki bean borer; ABB). Unlike other host‐plants, maize is yearly harvested, and harvesting practices impose severe mortality on larvae found above the cut‐off line. Positive geotaxis in the ECB has been proposed as a behavioural adaptation to harvesting practices, allowing larvae to move below the cut‐off line and thus escape harvest mortality. Here, we test whether the same behavioural adaptation evolved independently in Europe and in Asia. We sampled eight genetically differentiated ECB, ACB and ABB populations in France and China and monitored geotaxis through the entire larval development in artificial stacks mimicking maize stems. We find that all ECB and ACB populations show a similar tendency to move down during the latest larval stages, a behaviour not observed in any European or Asian ABB population. The behaviour is robustly expressed regardless of larval density, development mode or environmental conditions. Our results indicate that maize introduction triggered parallel behavioural adaptations in Europe and Asia, harvest selection presumably being the main driver.

Published
2016

13. Specialization to the host plant in Lepidoptera pests: pattern and process

Author

Marion Orsucci, Réjane Streiff, Alençon, Emmanuelle D., Philippe Audiot, Sylvie Gimenez, Nicolas Negre, Centre de Biologie pour la Gestion des Populations (UMR CBGP), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Diversité, Génomes & Interactions Microorganismes - Insectes [Montpellier] (DGIMI), Institut National de la Recherche Agronomique (INRA)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM), and Université de Montpellier (UM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de la Recherche Agronomique (INRA)

Subjects
[SDV]Life Sciences [q-bio]
Abstract

Specialization to the host plant in Lepidoptera pests: pattern and process. XVth ESEB Meeting

Published
2015

14. Host specialization involving attraction, avoidance and performance, in two phytophagous moth species

Author

Marion Orsucci, Anne Zanetto, Beatrice Ramora, Réjane Streiff, Denis Bourguet, Philippe Audiot, Alexandra Pommier, Christophe Raynaud, Centre de Biologie pour la Gestion des Populations (UMR CBGP), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Diversité, Génomes & Interactions Microorganismes - Insectes [Montpellier] (DGIMI), Institut National de la Recherche Agronomique (INRA)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM), DIASCOPE, Institut National de la Recherche Agronomique (INRA), University of Montpellier, and ANR-13-BSV7-0012,Adapt-Ome,Contributions du genome, du transcriptome et de l'épigénome à l'adaptation de lépidoptères (Ostrinia spp.) à leurs plantes hôtes(2013)

Subjects
0106 biological sciences, 0301 basic medicine, European corn borer, phytophagous insect, Oviposition, Moths, 010603 evolutionary biology, 01 natural sciences, Zea mays, Host Specificity, 03 medical and health sciences, Species Specificity, Specialization (functional), Avoidance Learning, [SDV.BV]Life Sciences [q-bio]/Vegetal Biology, Host plants, Animals, preference, Ecology, Evolution, Behavior and Systematics, Larva, biology, Ecology, Host (biology), fungi, biology.organism_classification, Attraction, Preference, 030104 developmental biology, Trait, Female, host specialization, performance, attraction
Abstract

International audience; Host specialization plays a key role in the extreme diversification of phytophagous insects. Whereas proximate mechanisms of specialization have been studied extensively, their consequences for species divergence remain unclear. Preference for, and performance on hosts are thought to be a major source of divergence in phytophagous insects. We assessed these major component of specialization in two moth species, the European corn borer (ECB) and the Adzuki bean borer (ABB), by testing their oviposition behavior in different conditions (choice or no-choice set-ups) and their performances, by reciprocal transplant at the larval stage on the usual host and an alternative host plant. We demonstrated that both ABB and ECB have a strong preference for their host plants for oviposition, but that relative larval performances on the usual host and an alternative host differed according to the experiment and the trait considered (weight or survival). Finally, we show for the first time that the preference for maize in ECB conceals a strong avoidance of mugwort. The differences in performance, attraction and avoidance between ECB and ABB are discussed in the light of the underlying mechanisms and divergence process.

Published
2015
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15. Introgression in natural populations of bioindicators: a case study of Carabus splendens and Carabus punctatoauratus

Author

Carine Brouat, R. Veyrier, Philippe Audiot, Serge Meusnier, and Réjane Streiff

Subjects
0106 biological sciences, Sympatry, 0303 health sciences, education.field_of_study, Genetic diversity, Ecology, Population, Biodiversity, Allopatric speciation, Introgression, 15. Life on land, Biology, 010603 evolutionary biology, 01 natural sciences, Gene flow, 03 medical and health sciences, Evolutionary biology, Genetics, education, Ecology, Evolution, Behavior and Systematics, 030304 developmental biology, Hybrid
Abstract

The evolutionary importance of hybridization in wild plants and animals has become increasingly widely recognized in the last decade. In practical terms, hybridization provides an exceptionally tough set of problems for conservation biologists. We illustrate this in a case study of two Carabidae species widely used to evaluate the impact of human activities on biodiversity. These two species live in a complex mosaic of sympatry/allopatry and are known to hybridize in controlled conditions. Hybridization has not been quantified in natural populations to date due to the lack of a simple set of phenotypic traits for identifying hybrids. We thus screened for hybrids in natural populations, by multilocus genotyping at nine microsatellite loci. A high level of genetic differentiation between these two taxa was observed, as shown by allelic frequency distributions. Two Bayesian assignment procedures without obligatory pure taxon references were used to infer different classes of hybrids (F(1), F(2) and backcrosses) and mixture proportions between the two species. A low level of hybridization (F(1) genotypes) was observed in natural populations, contrasting with results obtained in controlled conditions. A high level of introgression was, however, detected at three of 12 sites, as revealed by the detection of backcrossed genotypes. This interspecific gene flow was detected in a limited zone of the common geographical range of the two species and was not related to the pattern of sympatry/allopatry. We then considered the origin and repercussions of this introgression, based on intraspecific genetic diversity and geographical structure.

Published
2005
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16. Isolation by distance and sharp discontinuities in gene frequencies: implications for the phylogeography of an alpine insect species, Carabus solieri

Author

Stéphane Garnier, Philippe Audiot, Paul Alibert, B. Prieur, and Jean-Yves Rasplus

Subjects
Genetic diversity, education.field_of_study, Range (biology), Ecology, Population, Biology, Gene flow, Phylogeography, Genetic structure, Genetics, education, Genetic isolate, Ecology, Evolution, Behavior and Systematics, Isolation by distance
Abstract

Analysis of genetic isolation by distance (IBD) is of prime importance for the study of processes responsible for spatial population genetic structure and is thus frequently used in case studies. However, the identification of a significant IBD pattern does not necessarily imply the absence of sharp discontinuities in gene frequencies. Therefore, identifying barriers to gene flow and/or secondary contact between differentiated entities remains a major challenge in population biology. Geographical genetic structure of 41 populations (1080 individuals) of an alpine insect species, Carabus solieri , was studied using 10 microsatellite loci. All populations were significantly differentiated and spatially structured according to IBD over the entire range. However, clustering analyses clearly identified three main clusters of populations, which correspond to geographical entities. Whereas IBD also occurs within each cluster, population structure was different according to which group of populations was considered. The southernmost cluster corresponds to the most fragmented part of the range. Consistently, it was characterized by relatively high levels of differentiation associated with low genetic diversity, and the slope of the regression of genetic differentiation against geographical distances was threefold those of the two other clusters. Comparisons of within-cluster and between-cluster IBD patterns revealed barriers to gene flow. A comparison of the two approaches, IBD and clustering analyses, provided us with valuable information with which to infer the phylogeography of the species, and in particular to propose postglacial colonization routes from two potential refugia located in Italy and in southeastern France. Our study highlights strongly the possible confounding contribution of barriers to gene flow to IBD pattern and emphasizes the utility of the model-based clustering analysis to identify such barriers.

Published
2004
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17. Isolation and characterization of microsatellites in the endoparasitic ichneumonid wasp carrying a polydnavirus Hyposoter didymator

Author

Marie Frayssinet, Anne-Nathalie Volkoff, Denis Bourguet, Philippe Audiot, Véronique Jouan, Centre de Biologie pour la Gestion des Populations (UMR CBGP), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Diversité, Génomes & Interactions Microorganismes - Insectes [Montpellier] (DGIMI), Institut National de la Recherche Agronomique (INRA)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM), AIP Bioressources EcoMicro de l'Inra, Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Université de Montpellier (UM)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro - Montpellier SupAgro, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Université de Montpellier (UM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de la Recherche Agronomique (INRA), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), and Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)

Subjects
food.ingredient, lutte biologique, ravageur agricole, Helicoverpa armigera, Genome, Parasitoid, food, hyposoter didymator, Botany, Genetics, guêpe, Genotyping, [SDV.BDD]Life Sciences [q-bio]/Development Biology, Ecology, Evolution, Behavior and Systematics, biology, Polydnavirus, génome, [SDV.BA]Life Sciences [q-bio]/Animal biology, Pyrosequencing, insecta, biology.organism_classification, Ichneumonidae, parasite, Microsatellite, Ichnovirus, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, france
Abstract

The wasp Hyposoter didymator (Hymenoptera, Ichneumonidae) parasitizes several agricultural pest moths and could therefore be used in biological control. The 454 FLX Titanium pyrosequencing technology was used to define two distinct sets of multiplex combining 14 polymorphic microsatellite loci: 10 (referred to as HD) located within the genome of H. didymator and 4 (referred to as HdIV) located within the Ichnovirus genome which is integrated into the wasp genome. Genotyping of two populations collected in France on Helicoverpa armigera revealed that most of the loci are independent and at Hardy-Weinberg equilibrium.

Published
2014
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18. Microsatellite DNA markers for Lysiphlebus testaceipes

Author

Thomas Guillemaud, Gwenaëlle Genson, Xavier Fauvergue, Philippe Audiot, Réjane Streiff, Cédric Tentelier, Réponse des Organismes aux Stress Environnementaux (ROSE), Institut National de la Recherche Agronomique (INRA)-Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA), Centre de Biologie pour la Gestion des Populations (UMR CBGP), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut National de la Recherche Agronomique (INRA)-Université Nice Sophia Antipolis (... - 2019) (UNS), and Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)

Subjects
0106 biological sciences, MICROSATELLITE, Locus (genetics), Hymenoptera, Biology, LYSIPHLEBUS TESTACEIPES, 010603 evolutionary biology, 01 natural sciences, Biochemistry, General Biochemistry, Genetics and Molecular Biology, Loss of heterozygosity, 03 medical and health sciences, BRACONIDAE, Allele, 030304 developmental biology, [SDV.EE]Life Sciences [q-bio]/Ecology, environment, Genetics, 0303 health sciences, Aphid, Genetic diversity, ENRICHED LIBRARY, Ecology, PARASITOID, biology.organism_classification, Microsatellite, Braconidae
Abstract

International audience; Microsatellite loci were isolated from the aphid parasitoid Lysiphlebus testaceipes (Hymenoptera: Braconidae). Ten loci were obtained from an enriched partial genomic library. Genetic diversity was analysed at seven of these loci and two natural populations, one on oleander and one on citrus. The observed number of alleles ranged from one to 17, and the observed heterozygosity ranged from 0.37 to 0.82. In both populations, no departure from Hardy-Weinberg equilibrium was detected except for one locus. The differentiation between the two populations was characterized by an F-ST Of 0-09.

Published
2005
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19. When history repeats itself: Exploring the genetic architecture of host-plant adaptation in two closely related lepidopteran species

Author

Renaud Vitalis, Philippe Audiot, Denis Bourguet, Sandrine Cros-Arteil, Hermine Alexandre, Réjane Streiff, Sergine Ponsard, Centre de Biologie pour la Gestion des Populations (UMR CBGP), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Evolution et Diversité Biologique (EDB), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, ANR programme [09-BLAN-0145-01], Action Ponctuelle de Cooperation grant from Universite Toulouse III, INRA-CIRAD grant, TULIP [ANR-10-LABX-41], Streiff, Rejane, Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), and Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)

Subjects
0106 biological sciences, Sympatry, European corn borer, ostrinia, Speciation, [SDV]Life Sciences [q-bio], Population Dynamics, lcsh:Medicine, adaptation, Moths, 01 natural sciences, Ostrinia, Natural Selection, Cluster Analysis, Amplified Fragment Length Polymorphism Analysis, lcsh:Science, Genetics, 0303 health sciences, Multidisciplinary, Geography, Ecology, Reproductive isolation, Adaptation, Physiological, France, biologie de l'insecte, Research Article, pyrale du mais, Genetic Markers, China, Reproductive Isolation, Evolutionary Processes, maïs, Allopatric speciation, ravageur, Biology, Zea mays, 010603 evolutionary biology, Host-Parasite Interactions, 03 medical and health sciences, Species Specificity, Animals, 030304 developmental biology, Evolutionary Biology, eurasie, lcsh:R, Bayes Theorem, biology.organism_classification, Genetic architecture, Genetic Loci, Evolutionary Ecology, Evolutionary biology, lcsh:Q, Amplified fragment length polymorphism, Adaptation, Zoology, Entomology, Population Genetics
Abstract

The genus Ostrinia includes two allopatric maize pests across Eurasia, namely the European corn borer (ECB, O. nubilalis) and the Asian corn borer (ACB, O. furnacalis). A third species, the Adzuki bean borer (ABB, O. scapulalis), occurs in sympatry with both the ECB and the ACB. The ABB mostly feeds on native dicots, which probably correspond to the ancestral host plant type for the genus Ostrinia. This situation offers the opportunity to characterize the two presumably independent adaptations or preadaptations to maize that occurred in the ECB and ACB. In the present study, we aimed at deciphering the genetic architecture of these two adaptations to maize, a monocot host plant recently introduced into Eurasia. To this end, we performed a genome scan analysis based on 684 AFLP markers in 12 populations of ECB, ACB and ABB. We detected 2 outlier AFLP loci when comparing French populations of the ECB and ABB, and 9 outliers when comparing Chinese populations of the ACB and ABB. These outliers were different in both countries, and we found no evidence of linkage disequilibrium between any two of them. These results suggest that adaptation or preadaptation to maize relies on a different genetic architecture in the ECB and ACB. However, this conclusion must be considered in light of the constraints inherent to genome scan approaches and of the intricate evolution of adaptation and reproductive isolation in the Ostrinia spp. complex.

Published
2013
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20. De novo transcriptomic resources for two sibling species of moths: Ostrinia nubilalis and O. scapulalis

Author

Philippe Audiot, Emmanuelle Beyne, Denis Bourguet, Bernhard Gschloessl, Réjane Streiff, Centre de Biologie pour la Gestion des Populations (UMR CBGP), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Sciences Pour l'Oenologie (SPO), Université Montpellier 1 (UM1)-Institut National de la Recherche Agronomique (INRA)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Université Montpellier 1 (UM1)-Institut de Recherche pour le Développement (IRD [Nouvelle-Calédonie])-Institut National de la Recherche Agronomique (INRA)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Université de Montpellier (UM)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro - Montpellier SupAgro, and Institut National de la Recherche Agronomique (INRA)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Institut de Recherche pour le Développement (IRD [Nouvelle-Calédonie])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)

Subjects
0106 biological sciences, Candidate gene, [SDV]Life Sciences [q-bio], De novo transcriptome assembly, Ostrinia nubilalis, tanscriptome, Biology, Moths, 010603 evolutionary biology, 01 natural sciences, General Biochemistry, Genetics and Molecular Biology, Homology (biology), Ostrinia, Transcriptome, 03 medical and health sciences, Species Specificity, sibling species, Botany, Animals, RNA, Messenger, moth, Adzuki bean borer, 030304 developmental biology, Medicine(all), Comparative genomics, 0303 health sciences, Base Sequence, Ostrinia scapulalis, Biochemistry, Genetics and Molecular Biology(all), Genetic Variation, food and beverages, 454 sequencing, General Medicine, Reproductive isolation, biology.organism_classification, Genetic divergence, european corn borer, Evolutionary biology, NGS, Research Article
Abstract

Background: This study aimed at enhancing the transcriptomic resources for two sibling species of moths, Ostrinia scapulalis (Adzuki bean borer) and Ostrinia nubilalis (European corn borer), as a foundation for future researches on their divergence history. Previous works on these species had shown that their genetic divergence was low, while they were reproductively isolated in natura and specialized on different host plants. Comparative genomic resources will help facilitate the understanding of the mechanisms involved in this isolation and adaptation to the host plants. Despite their fundamental interest, these species still lack the genomic resources to thoroughly identify candidate genes for functions of interest. We present here a high throughput sequencing and de novo transcriptome assembly for these two sibling species in line with this objective of comparative genomics. Results: Based on 322,504 and 307,622 reads of 454 sequencing for O. scapulalis and O. nubilalis respectively, we reconstructed 11,231 and 10,773 transcripts, of which 40% were functionally annotated by BLAST analyzes. We determined the level of completeness of both assemblies as well as the recovery level of published Ostrinia genomic resources. Gene ontology (GO) of common and species-specific de novo transcripts did not reveal GO terms significantly enriched in one or the other species. By applying stringent homology searches on transcripts common to O. scapulalis and O. nubilalis, we identified a set of homologous transcripts, with a mean nucleotide identity value of 98.1%. In this set, the most divergent transcripts revealed candidate genes involved in developmental, sensorial and pathogen defense processes. Conclusions: This data greatly increases the genomic resources of Ostrinia species and constitute a solid skeleton for future comparative analyzes of expression or diversity, despite we show that the transcriptomes for both species have not been assembled at full completion. In addition, we provide a set of homologous transcripts together with their annotation as a source of candidate genes for comparative analyzes. Keywords: NGS, 454 sequencing, Tanscriptome, Moth, European corn borer, Adzuki bean borer, Sibling species, Ostrinia nubilalis, Ostrinia scapulalis

Published
2013
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21. Polymorphic microsatellites loci in the black Aphid, Aphis fabae Scopoli, 1763 (Hemiptera, Aphididae)

Author

Philippe Audiot, Jean-Yves Rasplus, Mbacké Sembène, and A. Coeur d’acier

Subjects
Aphid, Ecology, biology, Wahlund effect, food and beverages, Zoology, Aphididae, Subspecies, biology.organism_classification, Biochemistry, Hemiptera, General Biochemistry, Genetics and Molecular Biology, Gene flow, Aphis, Botany, Microsatellite
Abstract

Aphis fabae is a widespread pest in Europe. This species includes four morphological cryptic subspecies which are mostly identified by their partially distinct secondary host range. To determine the extent of gene flow and isolation between these four taxa, we isolated and characterized eight microsatellite loci from A. fabae fabae and tested them on the three other subspecies. Polymorphism ranged from five to 35 alleles on the 138 individuals collected. When analysing each taxon separately, significant deviations from Hardy-Weinberg (HW) equilibrum were observed. This could have different explanations, including the presence of null alleles, or the Wahlund effect or the mating system.

Published
2004
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22. From Russia with lobe: genetic differentiation in trilobed uncus Ostrinia spp. follows food plant, not hairy legs

Author

Andrei N. Frolov, Denis Bourguet, Julia M. Malysh, Yuri S. Tokarev, Anastasia G. Kononchuk, Sergine Ponsard, Réjane Streiff, Philippe Audiot, All-Russian Institute for Plant Protection, Partenaires INRAE, Centre de Biologie pour la Gestion des Populations (UMR CBGP), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Evolution et Diversité Biologique (EDB), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), and Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées

Subjects
Male, 0106 biological sciences, Reproductive Isolation, [SDV]Life Sciences [q-bio], Moths, Zea mays, 010603 evolutionary biology, 01 natural sciences, Russia, Ostrinia, 03 medical and health sciences, Species Specificity, Sensu, Genetic variation, Genetics, Animals, Herbivory, Genetics (clinical), 030304 developmental biology, Isolation by distance, 0303 health sciences, Ecology, biology, Host (biology), Genetic Variation, Reproductive isolation, biology.organism_classification, Lower Extremity, Evolutionary biology, Genetic structure, Original Article, Female, Taxonomy (biology), France, Plants, Edible
Abstract

International audience; Trilobed uncus taxa of the genus Ostrinia (Lepidoptera, Crambidae) illustrate the complex relationship, at early stages of speciation, between reproductive isolation and differentiation in morphology, resource use and genetic variation. On the basis of behaviour and ecology, we recently hypothesized that individuals with small mid-tibiae belong to two distinct species depending on host plant-O. nubilalis and O. scapulalis sensu Frolov et al. (2007) feeding on maize and on a number of dicotyledons, respectively. Individuals with small, medium or massive mid-tibiae would all belong to O. scapulalis as long as they feed on these dicotyledons. This contrasts with previous taxonomy, which distinguished three species by male mid-tibia morphology, regardless of host plant. Here, we test our hypothesis by examining the genetic structure of Ostrinia populations from regions with mid-tibia polymorphism Western Russia and Kazakhstan and comparing it with that of French populations where only small mid-tibiae occur. Results support two predictions: (1) maize- and dicotyledon-collected populations are genetically differentiated from each other like in France, and (2) dicotyledon-collected populations show no genetic evidence of consisting of more than one species. Between-species differentiation was unrelated to geographic distance, despite significant isolation by distance within species. The distinction between two and only two species differing by host plant thus holds at continental scale. Interestingly, one microsatellite locus contributed 10 times more than the others to differentiation between both taxa. This deserves further investigation, as it might reveal a linkage between this outlier and loci involved in host-plant adaptation and/or reproductive isolation.

Published
2012
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23. Microsatellite DNA markers for a grasshopper: Prionotropis hystrix rhodanica (Orthoptera, Pamphagidae)

Author

Jean-Yves Rasplus, Guenaelle Mondor-Genson, Philippe Audiot, and Réjane Streiff

Subjects
Genetics, Genetic diversity, Ecology, biology, Orthoptera, Endangered species, Zoology, biology.organism_classification, Biochemistry, General Biochemistry, Genetics and Molecular Biology, Loss of heterozygosity, Microsatellite, Pamphagidae, Allele, Grasshopper
Abstract

Microsatellite loci were isolated from Prionotropis hystrix rhodanica, an endangered grasshopper species, endemic to a steppic area southeast of France. Six polymorphic loci were obtained from an enriched partial genomic libray. A high genetic diversity was observed at all loci, with an observed number of alleles ranging from seven to 29, and an observed heterozygosity between 0.71 and 0.90. Test of cross-amplifications on two closely related taxa are presented.

Published
2002
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24. Did the introduction of maize into Europe provide enemy-free space to Ostrinia nubilalis? Parasitism differences between two sibling species of the genus Ostrinia

Author

Sergine Ponsard, Andrei N. Frolov, Rodolphe Sabatier, Benjamin Pélissié, Julia M. Malysh, Denis Bourguet, Céline Pélissier, Serge Meusnier, Yuri S. Tokarev, Eric Campan, Josette Chaufaux, Marc Delos, Philippe Audiot, Centre de Biologie pour la Gestion des Populations (UMR CBGP), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Evolution et Diversité Biologique (EDB), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Laboratory for Phytosanitary Diagnostics and Forecasts, All-Russian Institute for Plant Protection, Russian Academy of Sciences [Moscow] (RAS), Laboratoire Ecologie Fonctionnelle et Environnement (LEFE), Institut Ecologie et Environnement (INEE), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT), Sciences pour l'Action et le Développement : Activités, Produits, Territoires (SADAPT), Institut National de la Recherche Agronomique (INRA)-AgroParisTech, Service d'expérimentation de La Minière, Institut National de la Recherche Agronomique (INRA), Service Régional de la Protection des Végétaux (SRPV), Direction Régionale de l'Agriculture et de la Forêt (DRAF), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Université de Montpellier (UM)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro - Montpellier SupAgro, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Laboratoire Ecologie Fonctionnelle et Environnement (ECOLAB), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Université Toulouse III - Paul Sabatier (UT3), and Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP)

Subjects
0106 biological sciences, lydella thompsoni, pseudoperichaeta nigrolineata, Food Chain, Wasps, Ostrinia nubilalis, Parasitism, Genes, Insect, Moths, medicine.disease_cause, 010603 evolutionary biology, 01 natural sciences, Zea mays, Parasitoid, Ostrinia, ostrinia scapulalis, Host-Parasite Interactions, Mugwort, Species Specificity, Botany, Infestation, medicine, ecological speciation, ecologie, Animals, agricultural pest, Lydella thompsoni, Humulus, Ecology, Evolution, Behavior and Systematics, 2. Zero hunger, Macrocentrus cingulum, Larva, micrsporidia, Ostrinia scapulalis, biology, Pseudoperichaeta nigrolineata, [SDV.BID.EVO]Life Sciences [q-bio]/Biodiversity/Populations and Evolution [q-bio.PE], enemy-free space, ostrinia nubilalis, biology.organism_classification, macrocentrus cingulum, 010602 entomology, molecular detection, Artemisia, microsporidia, PEST analysis, France, Braconidae
Abstract

We examined whether maize offers enemy-free space (EFS) to its pest Ostrinia nubilalis, and may thereby have contributed to its divergence from the sibling species, Ostrinia scapulalis, feeding mainly on mugwort, when introduced into Europe five centuries ago. We collected Ostrinia larvae on maize (70 populations, 8425 individuals) and mugwort (10 populations, 1184 individuals) and recorded parasitism using both traditional (counting emerging parasitoids) and molecular methods (detection by specific polymerase chain reaction). The main parasitoid was Macrocentrus cingulum (Braconidae). On mugwort, parasitism was twice that on maize, and parasitoid-related mortality was 8 times higher. This suggests that maize affords substantial EFS to Ostrinia feeding on it. The lower Mortality:Infestation ratio in maize suggests that O. nubilalis' immune response might be stronger than that of O. scapulalis. If so, adapting to maize and diverging from O. scapulalis would decrease the impact of parasitism on O. nubilalis at both ecological and evolutionary levels.

Published
2009
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25. Genetic structure and gene flow in French populations of two Ostrinia taxa : host races or sibling species?

Author

Denis Bourguet, Sergine Ponsard, Thibaut Malausa, Réjane Streiff, Yannick Chaval, Philippe Audiot, Ambroise Dalecky, Evolution et Diversité Biologique (EDB), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Centre de Biologie pour la Gestion des Populations (UMR CBGP), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Université de Montpellier (UM)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro - Montpellier SupAgro, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), and Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)

Subjects
0106 biological sciences, Sympatry, European corn borer, Population genetics, Ostrinia nubilalis, sympatric speciation, Moths, 01 natural sciences, Linkage Disequilibrium, microsatellites, Ostrinia, Gene flow, ecological speciation, host race, hybridization, Phylogeny, Bayesian approaches, [SDV.EE]Life Sciences [q-bio]/Ecology, environment, 0303 health sciences, ECOLOGICAL SPECIATION, Geography, Ecology, [SDV.BA]Life Sciences [q-bio]/Animal biology, INSECTE, Sympatric speciation, Genetic structure, France, GENETIQUE DES POPULATIONS, Gene Flow, Genotype, BAYESIAN APPROACHES, MICROSATELLITE, [SDV.BID]Life Sciences [q-bio]/Biodiversity, Biology, 010603 evolutionary biology, Ecological speciation, 03 medical and health sciences, Genetics, Animals, [SDV.BBM]Life Sciences [q-bio]/Biochemistry, Molecular Biology, Ecology, Evolution, Behavior and Systematics, 030304 developmental biology, [SDV.GEN]Life Sciences [q-bio]/Genetics, Ostrinia scapulalis, Genetic Variation, biology.organism_classification, Genetic divergence, Evolutionary biology, HOST RACE, Animal Migration, gene flow
Abstract

Correspondance: : thibaut.malausa@sophia.inra.fr; International audience; Most models of ecological speciation concern phytophagous insects in which speciation is thought to be driven by host shifts and subsequent adaptations of populations. Despite the ever-increasing number of studies, the current evolutionary status of most models remains incompletely resolved, as estimates of gene flow between taxa remain extremely rare. We studied the population genetics of two taxa of the Ostrinia genus — one feeding mainly on maize and the other on mugwort and hop — occurring in sympatry throughout France. The actual level of divergence of these taxa was unknown because the genetic structure of populations had been investigated over a limited geographical area and the magnitude of gene flow between populations had not been estimated. We used 11 microsatellite markers to investigate the genetic structure of populations throughout France and the extent of gene flow between the two Ostrinia taxa at several sites at which they are sympatric. We observed clear genetic differentiation between most populations collected on the typical respective hosts of each taxon. However, populations displaying intermediate allelic frequencies were found on hop plants in southern France. Individual assignments revealed that this result could be accounted for by the presence of both taxa on the same host. Gene flow, estimated by determining the proportion of hybrids detected, was low: probably < 1% per generation, regardless of site. This indicates that the two Ostrinia taxa have reached a high level of genetic divergence and should be considered sibling species rather than host races

Published
2007
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26. Assortative mating between European corn borer pheromone races: beyond assortative meeting

Author

Philippe Audiot, Denis Bourguet, Laurent Pelozuelo, Sergine Ponsard, Serge Meusnier, The University of Tokyo (UTokyo), Centre de Biologie pour la Gestion des Populations (UMR CBGP), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Université de Montpellier (UM)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro - Montpellier SupAgro, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Evolution et Diversité Biologique (EDB), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), and Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées

Subjects
Male, 0106 biological sciences, European corn borer, [SDV]Life Sciences [q-bio], reproduction animale, Evolutionary Biology/Sexual Behavior, lcsh:Medicine, Moths, Choice Behavior, SEXUAL BEHAVIOR, 01 natural sciences, Pheromones, Sexual Behavior, Animal, Race (biology), amérique du nord, comportement sexuel, Mating, lcsh:Science, 0303 health sciences, Multidisciplinary, biology, Ecology, Reproductive isolation, Short distance, INSECTE, Sex pheromone, parasite, SEX PHEROMONE, Pheromone, Female, France, europe, pyrale du mais, Research Article, phéromone sexuelle, OSTRINIA NUBILALIS, INSECT, PESTS, ravageur, Zoology, 03 medical and health sciences, Animals, phéromone, Crosses, Genetic, 030304 developmental biology, Assortative mating, lcsh:R, biology.organism_classification, United States, 010602 entomology, Genetics, Population, lcsh:Q, usa
Abstract

Correspondance: ponsard@cict.fr; International audience; BACKGROUND: Sex pheromone communication systems may be a major force driving moth speciation by causing behavioral reproductive isolation via assortative meeting of conspecific individuals. The 'E' and 'Z' pheromone races of the European corn borer (ECB) are a textbook example in this respect. 'Z' females produce and 'Z' males preferentially respond to a 'Z' pheromone blend, while the 'E' race communicates via an 'E' blend. Both races do not freely hybridize in nature and their populations are genetically differentiated. A straightforward explanation would be that their reproductive isolation is a mere consequence of "assortative meeting" resulting from their different pheromones specifically attracting males towards same-race females at long range. However, previous laboratory experiments and those performed here show that even when moths are paired in a small box - i.e., when the meeting between sexual partners is forced - inter-race couples still have a lower mating success than intra-race ones. Hence, either the difference in attractivity of E vs. Z pheromones for males of either race still holds at short distance or the reproductive isolation between E and Z moths may not only be favoured by assortative meeting, but must also result from an additional mechanism ensuring significant assortative mating at close range. Here, we test whether this close-range mechanism is linked to the E/Z female sex pheromone communication system. METHODOLOGY/PRINCIPAL FINDINGS: Using crosses and backcrosses of E and Z strains, we found no difference in mating success between full-sisters emitting different sex pheromones. Conversely, the mating success of females with identical pheromone types but different coefficients of relatedness to the two parental strains was significantly different, and was higher when their genetic background was closer to that of their male partner's pheromone race. CONCLUSIONS/SIGNIFICANCE: We conclude that the close-range mechanism ensuring assortative mating between the E and Z ECB pheromone races is unrelated to the difference in female sex pheromone. Although the nature of this mechanism remains elusive, our results show that it is expressed in females, acts at close range, segregates independently of the autosome carrying Pher and of both sex chromosomes, and is widely distributed since it occurs both in France and in the USA

Published
2007
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27. Molecular differentiation at nuclear loci in French host races of the European corn borer (Ostrinia nubilalis)

Author

Siu F. Lee, Jean Francxois Martin, Denis Bourguet, Philippe Audiot, Laurianne Leniaud, Thibaut Malausa, Sergine Ponsard, Erik B. Dopman, Richard J. Harrison, Centre de Biologie pour la Gestion des Populations (UMR CBGP), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Laboratoire Dynamique de la Biodiversité (LADYBIO), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Institut de recherche sur la biologie de l'insecte UMR7261 (IRBI), Université de Tours (UT)-Centre National de la Recherche Scientifique (CNRS), University of Melbourne, Department of Ecology and Evolutionary Biology, Cornell University [New York], Université de Tours-Centre National de la Recherche Scientifique (CNRS), Evolution et Diversité Biologique (EDB), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), and Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3)

Subjects
Male, 0106 biological sciences, European corn borer, Time Factors, Nuclear gene, Population, Genes, Insect, [SDV.BID]Life Sciences [q-bio]/Biodiversity, Moths, Investigations, Zea mays, 010603 evolutionary biology, 01 natural sciences, Ostrinia, Evolution, Molecular, 03 medical and health sciences, Molecular evolution, Genetics, Animals, [SDV.BV]Life Sciences [q-bio]/Vegetal Biology, education, Phylogeny, DNA Primers, 030304 developmental biology, [SDV.EE]Life Sciences [q-bio]/Ecology, environment, 0303 health sciences, education.field_of_study, [SDV.GEN]Life Sciences [q-bio]/Genetics, Polymorphism, Genetic, Base Sequence, Models, Genetic, biology, Host (biology), DNA, Reproductive isolation, biology.organism_classification, INSECTE, Genetics, Population, Sympatric speciation, Female, OSTRINIA NUBILALIS, France, GENETIQUE DES POPULATIONS, [SDE.BE]Environmental Sciences/Biodiversity and Ecology
Abstract

Corresponding author: thibaut.malausa@sophia.inra.fr; International audience; French populations of the European corn borer consist of two sympatric and genetically differentiated host races. As such, they are well suited to study processes that could be involved in sympatric speciation, but the initial conditions of host-race divergence need to be elucidated. Gene genealogies can provide insight into the processes involved in speciation. We used DNA sequences of four nuclear genes to (1) document the genetic structure of the two French host races previously delineated with allozyme markers, (2) find genes directly or indirectly involved in reproductive isolation between host races, and (3) estimate the time since divergence of the two taxa and see whether this estimate is compatible with this divergence being the result of a host shift onto maize after its introduction into Europe _500 years ago. Gene genealogies revealed extensive shared polymorphism, but confirmed the previously observed genetic differentiation between the two host races. Significant departures from the predictions of neutral molecular evolution models were detected at three loci but were apparently unrelated to reproductive isolation between host races. Estimates of time since divergence between French host races varied from _75,000 to _150,000 years, suggesting that the two taxa diverged recently but probably long before the introduction of maize into Europe

Published
2007
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28. Genetic structure of European and Mediterranean maize borer populations on several wild and cultivated host plants

Author

G. Genestier, Siu F. Lee, Brigitte Frérot, Denis Bourguet, Philippe Audiot, Sergine Ponsard, Laurianne Leniaud, Thibaut Malausa, Anne Hélène Le Pallec, Marie Claude Souqual, Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Centre de Biologie pour la Gestion des Populations (UMR CBGP), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Physiologie de l'Insecte : Signalisation et Communication (PISC), Institut National de la Recherche Agronomique (INRA)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National Agronomique Paris-Grignon (INA P-G), Centre for environmental stress and adaptation research (CESAR), University of Melbourne, Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Laboratoire Dynamique de la Biodiversité (LADYBIO), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Laboratoire Communication chimique (UMR PISC 1272), Institut National de la Recherche Agronomique (INRA), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Université de Toulouse (UT), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Université de Montpellier (UM)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro - Montpellier SupAgro, and Tertre, Christiane

Subjects
0106 biological sciences, refuge crop, CRAMBIDAE, Sesamia nonagrioides, Ostrinia nubilalis, [SDV.BID]Life Sciences [q-bio]/Biodiversity, NOCTUIDAE, 010603 evolutionary biology, 01 natural sciences, Ostrinia, Lepidoptera genitalia, Crambidae, host races, Helianthus annuus, SESAMIA NONAGRIOIDES, Ecology, Evolution, Behavior and Systematics, biology, RESISTANCE EVOLUTION, 15. Life on land, biology.organism_classification, Sorghum, LEPIDOPTERA, transgenic insecticidal maize, 010602 entomology, Agronomy, Insect Science, Genetic structure, PEST analysis
Abstract

International audience; Target pests may become resistant to Bacillus thuringiensis (Bt) toxins produced by trangenic maize (Zea mays L.). Untreated refuge areas are set aside to conserve high frequencies of susceptibility alleles: a delay in resistance evolution is expected if susceptible individuals from refuges mate randomly with resistant individuals from Bt fields. In principle, refuges can be toxin-free maize or any other plant, provided it hosts sufficiently large pest populations mating randomly with populations from Bt-maize fields. Our aim was to examine the suitability of several cultivated or weedy plants [pepper (Capsicum frutescens L.), sorghum (Sorghum spec.), sunflower (Helianthus annuus L.), cocklebur (Xanthium spec.), cantaloupe (Cucumis melo L.), and hop (Humulus lupulus L.)] as refuges for Ostrinia nubilalis (Hübner) (Lepidoptera: Crambidae) and Sesamia nonagrioides Lefebvre (Lepidoptera: Noctuidae), two major maize pests in southern Europe. Larvae of both species were collected on these plants. Their genetic population structure was examined at several allozyme loci. We found little or no evidence for an influence of geographic distance, but detected a significant host-plant effect on the genetic differentiation for both species. Ostrinia nubilalis populations from sunflower, pepper, cocklebur, and sorghum appear to belong to the same genetic entity as populations collected on maize, but to differ from populations on hop. Accordingly, females from pepper and cocklebur produced exclusively the 'Z' type sexual pheromone, which, in France, characterizes populations developing on maize. Qualitatively, these plants (except hop) could thus serve as refuges for O. nubilalis; however, they may be of little use quantitatively as they were found much less infested than maize. Sesamia nonagrioides populations on maize and sorghum reached comparable densities, but a slight genetic differentiation was detected between both. The degree of assortative mating between populations feeding on both hosts must therefore be assessed before sorghum can be considered as a suitable refuge for this species.

Published
2006
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29. Genetic survey of two endangered grasshopper subspecies, Prionotropis hystrix rhodanica and Prionotropis hystrix azami (Orthoptera, Pamphagidae): within- and between-population dynamics at the regional scale

Author

Jean-Yves Rasplus, Antoine Foucart, Philippe Audiot, Michel Lecoq, Réjane Streiff, Centre de Biologie pour la Gestion des Populations (UMR CBGP), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), and Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)

Subjects
0106 biological sciences, Biodiversity, habitat, Flux de gènes, Subspecies, 01 natural sciences, Génétique des populations, Marqueur génétique, 0303 health sciences, education.field_of_study, Ecology, espèce en danger, Écologie des populations, Genetic structure, L20 - Écologie animale, GENETIQUE DES POPULATIONS, Distribution géographique, Population, CONSERVATION, MICROSATELLITE, Biology, 010603 evolutionary biology, 03 medical and health sciences, Variation génétique, Genetic drift, Genetics, GENE FLOW, education, Ecology, Evolution, Behavior and Systematics, 030304 developmental biology, Genetic diversity, GENETIC STRUCTURE, [SDV.GEN]Life Sciences [q-bio]/Genetics, PRIONOTOPIS HYSTRIX RHODANICA, Migration animale, 15. Life on land, Acrididae, H10 - Ravageurs des plantes, GRASSHOPPER, Conservation biologique, DRIFT, Threatened species, Biological dispersal
Abstract

Corresponding author:streiff@supagro.inra.fr; International audience; The fragmentation and destruction of natural habitats is one of the major causes of extinction of wild flora and fauna due to human activities. The area around the Mediterranean Basin is particularly affected: this region is one of the world’s richest in terms of biodiversity and is undergoing substantial modification due to extensive changes in land use. We investigated the demographic state (through a genetic survey) of an endangered grasshopper, the geographical distribution of which is restricted to arid open land or glades in south-eastern France. We compared two subspecies: one is severely threatened by the fragmentation of its specific and restricted habitat (Prionotropis hystrix rhodanica in the ‘Crau’ steppe) whereas the other, P. h. azami, occurs more widely in glades or clearings in the evergreen Mediterranean forest. Genetic diversity at eight microsatellite loci was highly structured, indicating substantial isolation of populations. Within-population diversity was high at all but one site. Genetic drift was the major force involved in this genetic structure, with very little gene flow at the regional scale of observation, consistent with both the limited dispersal of this flightless species and the patchy configuration of its habitat. No significant differences in the extent of genetic diversity or population dynamics were observed between the two sub-species. The observed genetic pattern calls into question the validity of the subspecies status, and shows no strong impact of recent anthropogenic modification of the Crau steppe. The evolution of the Mediterranean3323 xeric and open habitats under both natural and anthropogenic processes is discussed

Published
2005
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30. Fine-scale genetic structure of two carabid species with contrasted levels of habitat specialization

Author

Carine Brouat, Jean-Yves Rasplus, Raphaël Leblois, F. Sennedot, Philippe Audiot, Centre de Biologie pour la Gestion des Populations (UMR CBGP), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Institut des Sciences de l'Evolution de Montpellier (UMR ISEM), École pratique des hautes études (EPHE), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Montpellier (UM)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre National de la Recherche Scientifique (CNRS)-Institut de recherche pour le développement [IRD] : UR226

Subjects
0106 biological sciences, Conservation of Natural Resources, Biology, Environment, Generalist and specialist species, 010603 evolutionary biology, 01 natural sciences, Gene flow, Evolution, Molecular, 03 medical and health sciences, Genetics, Forest plot, Animals, Cluster Analysis, Ecology, Evolution, Behavior and Systematics, 030304 developmental biology, Isolation by distance, 0303 health sciences, [SDV.GEN.GPO]Life Sciences [q-bio]/Genetics/Populations and Evolution [q-bio.PE], Models, Genetic, Ecology, [SDV.BID.EVO]Life Sciences [q-bio]/Biodiversity/Populations and Evolution [q-bio.PE], Genetic Variation, 15. Life on land, Coleoptera, Genetics, Population, Habitat, Genetic structure, Microsatellite, Biological dispersal, France, Microsatellite Repeats
Abstract

Using microsatellite markers, we compared the genetic structure of populations of two carabid species, one described as a generalist (commonly found in forest and in open habitats) and the other known as a forest specialist. Both species were sampled in the same forest plots, which were separated from each other by either open or forested areas. At the local scale considered (13.6 km separating the most distant plots), genetic differentiation was substantial for both species studied, but populations of the forest specialist Carabus punctatoauratus appeared to be more spatially structured than those of C. nemoralis. Isolation by distance analyses showed that nonforested areas are partial barriers to gene flow for both species studied, although more clearly for the forest specialist. Between and within forests, dispersal capacity of the generalist C. nemoralis was shown to be higher than that of the specialist C. punctatoauratus.

Published
2003
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31. Setting conservation priorities: The case study of Carabus solieri (Col. Carabidae)

Author

Philippe Audiot, Stéphane Garnier, Silvain Piry, Serge Meusnier, Jean-Yves Rasplus, Jean-Marie Cornuet, and G. Mondor

Subjects
Genetic diversity, Range (biology), III — Méthodes D’inventaire et de Caractérisation de la Diversité Génétique en Milieu Naturel / Methods for Inventory and Characterization of Genetic Diversity in Natural Environment, Carabus, Endangered species, Population genetics, General Medicine, Biology, Subspecies, biology.organism_classification, Gene flow, Phylogeography, Evolutionary biology, Genetics, Animal Science and Zoology, Ecology, Evolution, Behavior and Systematics
Abstract

C. solieri is an endangered species of Carabidae which is mostly associated with humid forests of the Alps, in Prance and in Liguria (Italy). We reanalysed morphological data published by Bonadona and compared the results to the molecular data set presented here. We used partial sequences of the mitochondrial cytochrome b gene and seven microsatellite loci to evaluate genetic diversity among and between populations and to propose a phylogeographic scenario. We recognised two basic entities, considered as subspecies, which probably colonised the present distribution range from two main refugia (in France and in Italy). There is no strict agreement between morphological and molecular data and we propose that hybridisation and introgres-sion between the two subspecies have led to the observed patterns of distribution of the characters. Our results show that sampled populations differ significantly in microsatellite allele frequencies even though some populations are < 15 km apart. Gene flow estimates between the 19 sampled populations indicated very restricted exchange. This is in agreement with the low vagility observed for most species of Carabus. Consequently, the Solier’s Carab is genetically structured on an extremely fine scale, and local population within a definite forest should be considered as management units. In the light of our data on C. solieri we discuss the usefulness, when hybridisation occurs, of the two main criteria usually quoted for identifying candidate populations for conservation management (uniqueness and diversity) and give some conservation recommendations for C. solieri.

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