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1. The independent acquisition of plant root nitrogen-fixing symbiosis in Fabids recruited the same genetic pathway for nodule organogenesis.

Author

Sergio Svistoonoff, Faiza Meriem Benabdoun, Mathish Nambiar-Veetil, Leandro Imanishi, Virginie Vaissayre, Stella Cesari, Nathalie Diagne, Valérie Hocher, Françoise de Billy, Jocelyne Bonneau, Luis Wall, Nadia Ykhlef, Charles Rosenberg, Didier Bogusz, Claudine Franche, and Hassen Gherbi

Subjects
Medicine, Science
Abstract

Only species belonging to the Fabid clade, limited to four classes and ten families of Angiosperms, are able to form nitrogen-fixing root nodule symbioses (RNS) with soil bacteria. This concerns plants of the legume family (Fabaceae) and Parasponia (Cannabaceae) associated with the Gram-negative proteobacteria collectively called rhizobia and actinorhizal plants associated with the Gram-positive actinomycetes of the genus Frankia. Calcium and calmodulin-dependent protein kinase (CCaMK) is a key component of the common signaling pathway leading to both rhizobial and arbuscular mycorrhizal symbioses (AM) and plays a central role in cross-signaling between root nodule organogenesis and infection processes. Here, we show that CCaMK is also needed for successful actinorhiza formation and interaction with AM fungi in the actinorhizal tree Casuarina glauca and is also able to restore both nodulation and AM symbioses in a Medicago truncatula ccamk mutant. Besides, we expressed auto-active CgCCaMK lacking the auto-inhibitory/CaM domain in two actinorhizal species: C. glauca (Casuarinaceae), which develops an intracellular infection pathway, and Discaria trinervis (Rhamnaceae) which is characterized by an ancestral intercellular infection mechanism. In both species, we found induction of nodulation independent of Frankia similar to response to the activation of CCaMK in the rhizobia-legume symbiosis and conclude that the regulation of actinorhiza organogenesis is conserved regardless of the infection mode. It has been suggested that rhizobial and actinorhizal symbioses originated from a common ancestor with several independent evolutionary origins. Our findings are consistent with the recruitment of a similar genetic pathway governing rhizobial and Frankia nodule organogenesis.

Published
2013
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2. Biotechnological strategies for studying actinorhizal symbiosis in Casuarinaceae: transgenesis and beyond

Author

Jocelyne Bonneau, Qingbin Jiang, Didier Bogusz, Emilie Froussart, Claudine Franche, Chonglu Zhong, Diversité, adaptation, développement des plantes (UMR DIADE), Institut de Recherche pour le Développement (IRD [France-Sud])-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Université Montpellier 2 - Sciences et Techniques (UM2)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-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), Chinese Academy of Forestry, and Research conducted in the Rhizogenesis laboratory on actinorhizal plants was supported by the Institut de Recherche pour le Développement (IRD). Projects developed in the Research Institute of Tropical Forestry were supported by Forestry Science and Technology Innovation Project of Guangdong (2014KJCX017) and the CAF International Cooperation Innovation Project. Emilie Froussart was a PhD student at the University of Montpellier and benefited from a grant of the Labex Agro-Agropolis Fondation.

Subjects
0106 biological sciences, 0301 basic medicine, Agrobacterium, Frankia, Plant transformation technology, Mediated Genetic-transformation, Computational biology, Casuarina, 01 natural sciences, Genome, 03 medical and health sciences, Nitrogen fixation, Genome editing, RNA interference, T-DNA integration, Tree allocasuarina-verticillata, 2. Zero hunger, Transcription activator-like effector nuclease, biology, business.industry, Actinorhizal nodule, Agrobacterium tumefaciens, 15. Life on land, biology.organism_classification, Biotechnology, [SDV.BV.AP]Life Sciences [q-bio]/Vegetal Biology/Plant breeding, 030104 developmental biology, Lotus-japonicus, General Agricultural and Biological Sciences, Actinorhizal plant, business, 010606 plant biology & botany
Abstract

International audience; Since the recovery of the first transgenic plant in the early 1980s, plant transformation technologies have enabled advances in many aspects of basic plant science, including nitrogen-fixing root endosymbioses. Using the biological vectors Agrobacterium tumefaciens and A. rhizogenes, gene constructs have been successfully introduced in the actinorhizal tree species Casuarina glauca, thereby paving the way for functional analysis of the key genes involved in the symbiotic process with the actinobacterium Frankia. In recent years, not only studies of gene promoters in transgenic Casuarinaceae, but also the use of RNA interference to down-regulate genes of interest, have provided new insights into the early stages of the interaction between the root system and the actinobacterium. Opportunities offered by recent developments in genome editing technologies based on the engineered nucleases ZFNs (zinc-finger nucleases), TALENs (transcription activator-like effector nucleases) and RNA-guided CRISPR-Cas (clustered regularly interspaced short palindromic repeats-associated protein/Cas) will be briefly presented.

Published
2016
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3. Recent advances in actinorhizal symbiosis signaling

Author

Emilie Froussart, Claudine Franche, Didier Bogusz, Jocelyne Bonneau, Diversité, adaptation, développement des plantes (UMR DIADE), Institut de Recherche pour le Développement (IRD [France-Sud])-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), and ANR-06-BLAN-0095,NewNod,Identification of new molecular determinants involved in the early steps of symbiotic interactions between plants and bacteria(2006)

Subjects
0106 biological sciences, 0301 basic medicine, Root nodule, [SDV]Life Sciences [q-bio], Frankia, Rhizobia, Plant Science, Nodulation, [SDV.BID.SPT]Life Sciences [q-bio]/Biodiversity/Systematics, Phylogenetics and taxonomy, Plant Root Nodulation, Plant Roots, 01 natural sciences, Glomeromycota, 03 medical and health sciences, Symbiosis, Mycorrhizae, Nitrogen Fixation, Botany, Genetics, [SDV.BV]Life Sciences [q-bio]/Vegetal Biology, Actinorhizal plants, Indoleacetic Acids, biology, Ecology, fungi, food and beverages, Fabaceae, Nitrogen-fixing root nodule symbiosis, General Medicine, biology.organism_classification, Signaling, 030104 developmental biology, Rhizosphere, Rhizobium, Actinorhizal plant, Agronomy and Crop Science, Signal Transduction, 010606 plant biology & botany
Abstract

International audience; Nitrogen and phosphorus availability are frequent limiting factors in plant growth and development. Certain bacteria and fungi form root endosymbiotic relationships with plants enabling them to exploit atmospheric nitrogen and soil phosphorus. The relationships between bacteria and plants include nitrogen-fixing Gram-negative proteobacteria called rhizobia that are able to interact with most leguminous plants (Fabaceae) but also with the non-legume Parasponia (Cannabaceae), and actinobacteria Frankia, which are able to interact with about 260 species collectively called actinorhizal plants. Fungi involved in the relationship with plants include Glomeromycota that form an arbuscular mycorrhizal (AM) association intracellularly within the roots of more than 80% of land plants. Increasing numbers of reports suggest that the rhizobial association with legumes has recycled part of the ancestral program used by most plants to interact with AM fungi. This review focuses on the most recent progress made in plant genetic control of root nodulation that occurs in non-legume actinorhizal plant species.

Published
2016
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4. Hairy roots production in Phyllanthus odontadenius Mll. Arg. by seedlings transformed with Agrobacterium rhizogenes A4RS/pHKN29

Author

A Diamuini Ndofunsu, Virginie Vaissayre, S Luyindula Ndiku, Claudine Franche, Jocelyne Bonneau, and R Kikakedimau Nakweti

Subjects
Tissue culture, Phyllanthus, Germination, Agrobacterium, Botany, Plasmodium falciparum, General Medicine, Genetically modified crops, Biology, Phyllanthaceae, Medicinal plants, biology.organism_classification
Abstract

Phyllanthus odontadenius Mull. Arg is one of the most important medicinal plants in the genus Phyllanthus (Phyllanthaceae). It is used in different regions in the world for the treatment of various diseases for example malaria caused by Plasmodium falciparum causing millions deaths in tropical and subtropical regions. In this work, we experimented P. odontadenius seeds germination and seedlings infected by Agrobacterium rhizogenes A4RS/pHKN9. We obtained 36% of seeds that germinated for 84.6% of seedlings transformed which showed positive gfp activities. The number of hairy roots formed in infectious sites for seedlings infected with A. rhizogenes A4RS/pHKN29 is valued at 6.3±2.71 against 0 for control seedlings. Diagrams showed that mean length for the new-formed roots were 1.92±0.55 cm and 1.59±0.49 cm for hairy root. Key words: Phyllanthus odontadenius, hairy roots, Agrobacterium rhizogenes, malaria, secondary metabolites.

Published
2015
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5. Biological nitrogen fixation

Author

Jocelyne Bonneau, Didier Bogusz, Sergio Svistoonoff, Laurent Laplaze, Valérie Hocher, Nathalie Diagne, Antony Champion, Alexandre Tromas, Nicole Alloisio, De Bruijn, F.J. (ed.), Laboratoire Commun de Microbiologie IRD/ISRA/UCA, Université Cheikh Anta Diop [Dakar, Sénégal] (UCAD), Laboratoire des symbioses tropicales et méditerranéennes (UMR LSTM), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Université Montpellier 1 (UM1)-Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Laboratoire d'Ecologie Microbienne - UMR 5557 (LEM), Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Vétérinaire de Lyon (ENVL)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de la Recherche Agronomique (INRA)-VetAgro Sup - Institut national d'enseignement supérieur et de recherche en alimentation, santé animale, sciences agronomiques et de l'environnement (VAS), Frans J. de Bruijn, 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 Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-VetAgro Sup - Institut national d'enseignement supérieur et de recherche en alimentation, santé animale, sciences agronomiques et de l'environnement (VAS)-Ecole Nationale Vétérinaire de Lyon (ENVL)

Subjects
0106 biological sciences, 0303 health sciences, biology, Ecology, [SDV]Life Sciences [q-bio], biology.organism_classification, 01 natural sciences, 03 medical and health sciences, Alnus glutinosa, Symbiosis, Botany, Nitrogen fixation, Casuarina glauca, Actinorhizal plant, ComputingMilieux_MISCELLANEOUS, 030304 developmental biology, 010606 plant biology & botany
Abstract

International audience

Published
2015
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6. Inhibition of auxin signaling in Frankia species-infected cells in Casuarina glauca nodules leads to increased nodulation

Author

Maïmouna Cissoko, Laurent Laplaze, Valérie Hocher, Issa Diedhiou, Elodie Pirolles, Hassen Gherbi, Mikaël Lucas, Jocelyne Bonneau, Daniel Moukouanga, Sergio Svistoonoff, Antony Champion, Hermann Prodjinoto, Amandine Crabos, Virginie Vaissayre, Alexandre Tromas, Claudine Franche, Diversité, adaptation, développement des plantes (UMR DIADE), and Institut de Recherche pour le Développement (IRD [France-Sud])-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)

Subjects
0106 biological sciences, Root nodule, Ntrogen-fixation, Physiology, [SDV]Life Sciences [q-bio], Frankia, Cytokinin, Expression, Autoregulation, Plant Science, 01 natural sciences, 03 medical and health sciences, Symbiosis, Auxin, Botany, Genetics, [SDV.BV]Life Sciences [q-bio]/Vegetal Biology, Origins, 030304 developmental biology, chemistry.chemical_classification, 0303 health sciences, biology, Plant Root Nodulation, fungi, food and beverages, 15. Life on land, Genetic-basis, biology.organism_classification, Actinorhizal symbioses, Allocasuarina-verticillata, chemistry, Nitrogen fixation, Perception, Plant hormone, Actinorhizal plant, 010606 plant biology & botany
Abstract

Actinorhizal symbioses are mutualistic interactions between plants and the soil bacteria Frankia spp. that lead to the formation of nitrogen-fixing root nodules. The plant hormone auxin has been suggested to play a role in the mechanisms that control the establishment of this symbiosis in the actinorhizal tree Casuarina glauca. Here, we analyzed the role of auxin signaling in Frankia spp.-infected cells. Using a dominant-negative version of an endogenous auxin-signaling regulator, INDOLE-3-ACETIC ACID7, we established that inhibition of auxin signaling in these cells led to increased nodulation and, as a consequence, to higher nitrogen fixation per plant even if nitrogen fixation per nodule mass was similar to that in the wild type. Our results suggest that auxin signaling in Frankia spp.-infected cells is involved in the long-distance regulation of nodulation in actinorhizal symbioses.

Published
2015
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7. Geodetic measurements of convergence across the New Hebrides Subduction Zone

Author

Pierre Lebellegard, Frederick W. Taylor, Jacques Récy, Michael Bevis, Didier Maillard, Jocelyne Bonneau, and Stéphane Calmant

Subjects
TECTONIQUE DE PLAQUES, Subduction, GEODESIE, New Hebrides, Geodetic datum, Slip (materials science), COMPRESSION TECTONIQUE, SYSTEME DE POSITIONNEMENT GLOBAL, Geophysics, SUBDUCTION, Rate of convergence, CONVERGENCE, VARIATION SPATIALE, Trench, General Earth and Planetary Sciences, Island arc, Shear zone, Geology, Seismology
Abstract

Between 1990 and 1994, geodetic measurements (GPS observations) have been conducted across the New Hebrides subduction zone where the Australia plate subducts under the New Hebrides Arc. This paper establishes convergence rate variations along the trench. In the South, at Tanna, the relative motion is oriented N244 ±4 and has a uniform rate of 11.7±0.8 cm/yr. The rate at Efate is 10.3±0.9 cm/yr, oriented N242 ±4. Both azimuths very well compare with slip vectors of the last major earthquakes. In the North, the rate at Santo is only 3.6 ±1.2 cm/yr, oriented N253 ± 26. The difference in the convergence rates between Santo on the one hand and Efate and Tanna in the other hand points to a right lateral shear zone between Santo and Efate. At Santo where the plate coupling is very high, the very low convergence rate might be related to the absence of recent strong earthquakes. No significant variations are detected for the baselines within the Australia plate.

Published
1995
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8. Contribution of transgenic Casuarinaceae to our knowledge of the actinorhizal symbioses

Author

Didier Bogusz, Virginie Vaissayre, Florence Auguy, Mathish Nambiar-Veetil, Patrick Doumas, Chonglu Zhong, Sergio Svistoonoff, Valérie Hocher, Claudine Franche, Zuzanna Michalak, Hassen Gherbi, Jocelyne Bonneau, Laurent Laplaze, Diversité et adaptation des plantes cultivées (UMR DIAPC), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Université Montpellier 2 - Sciences et Techniques (UM2), Plant Biotechnology Division, Institute of Forest Genetics and Tree Breeding, Research Institute of Tropical Forestry, Chinese Academy of Forestry, UMR 1097 DIa-PC, Institut National de la Recherche Agronomique (INRA), Biochimie et Physiologie Moléculaire des Plantes (BPMP), Université de Montpellier (UM)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Institut National de la Recherche Agronomique (INRA)-Centre National de la Recherche Scientifique (CNRS), Equipe Adaptation des plantes aux métaux (METAUX), Université de Montpellier (UM)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Institut National de la Recherche Agronomique (INRA)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Institut National de la Recherche Agronomique (INRA)-Centre National de la Recherche Scientifique (CNRS), 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), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut National de la Recherche Agronomique (INRA)-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)

Subjects
0106 biological sciences, hairy root, tumefaciens, signaling pathway, Allocasuarina verticillata, Casuarinaceae, Root nodule, Frankia, Agrobacterium, legume evolution, agrobacterium-rhizogenes, nitrogen-fixing tree, alnus-glutinosa, arabidopsis-thaliana, nodule development, Symbiotic, Casuarina, 01 natural sciences, lateral root initiation, 03 medical and health sciences, Botany, [SDV.BV]Life Sciences [q-bio]/Vegetal Biology, Casuarina glauca, [SDV.BDD]Life Sciences [q-bio]/Development Biology, Root hair infection, 030304 developmental biology, 2. Zero hunger, 0303 health sciences, Allocasuarina, biology, Ecology, [SDV.BA]Life Sciences [q-bio]/Animal biology, 15. Life on land, tree allocasuarina-verticillata, biology.organism_classification, Root hair, Actinorhizal symbiosis, Agrobacterium rhizogenes, infection, Symbiotic signaling pathway, cell-cycle, Agrobacterium tumefaciens, General Agricultural and Biological Sciences, Actinorhizal plant, 010606 plant biology & botany
Abstract

The Casuarinaceae family is a group of 96 species of trees and shrubs that are tolerant to adverse soil and climatic conditions. In the field, Casuarinaceae bears nitrogen-fixing root nodules (so called actinorhizal nodules) resulting from infection by the soil actinomycete Frankia. The association between Casuarina and Frankia is of tremendous ecological importance in tropical and subtropical areas where these trees contribute to land stabilization and soil reclamation. During differentiation of the actinorhizal nodule, a set of genes called actinorhizal nodulins is activated in the developing nodule. Understanding the molecular basis of actinorhizal nodule ontogenesis requires molecular tools such as genomics together with gene transfer technologies for functional analysis of symbiotic genes. Using the biological vectors Agrobacterium rhizogenes and A. tumefaciens, gene transfer into the two species Allocasuarina verticillata and Casuarina glauca has been successful. Transgenic Casuarinaceae plants proved to be valuable tools for exploring the molecular mechanisms resulting from the infection process of actinorhizal plants by Frankia.

Published
2010
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9. Les arbres actinorhiziens de la famille des Casuarinaceae : utilisations et étude de la plasticité racinaire face aux contraintes abiotiques

Author

Laurent Laplaze, Didier Bogusz, Hassen Gherbi, Sergio Svistoonoff, Jocelyne Bonneau, Valérie Hocher, Patrick Doumas, Claudine Franche, Virginie Vayssaire, Nathalie Diagne, and Florence Auguy

Abstract

Les plantes susceptibles d’etablir une symbiose fixatrice d’azote avec l’actinomycete du sol Frankia sont appelees plantes actinorhiziennes. Ce sont principalement des plantes ligneuses, capables de coloniser des sols pauvres et de tolerer une grande variete de stress. Dans les regions tropicales arides et semi-arides, les arbres actinorhiziens de la famille des Casuarinaceae sont tres utilises pour rehabiliter les sols degrades, proteger les zones cotieres et les cultures de l’ensablement, et fournir du bois de chauffe. Les facultes d’adaptation de Casuarina aux sols carences en elements nutritifs sont liees a la plasticite racinaire remarquable de cet arbre qui adapte son programme de developpement en fonction de son environnement. Les recherches entreprises dans notre laboratoire visent a comprendre les bases moleculaires de cette plasticite chez l’espece Casuarina glauca. Des approches genomiques et des etudes d’analyse fonctionnelle de genes candidats sont developpees en partenariat avec des laboratoires du Sud. Mots cles

Published
2010
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