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Start Over Author "Droc, Gaëtan" Journal annals of botany
2 results on '"Droc, Gaëtan"'

1. Three founding ancestral genomes involved in the origin of sugarcane

Author

Pompidor, Nicolas, Charron, Carine, Hervouet, Catherine, Bocs, Stéphanie, Droc, Gaëtan, Rivallan, Ronan, Manez, Aurore, Mitros, Therese, Swaminathan, Kankshita, Glaszmann, Jean-Christophe, Garsmeur, Olivier, and D’Hont, Angélique

Subjects
Human Genome, Genetics, Biotechnology, Genome, Plant, Genomics, Haplotypes, Polyploidy, Saccharum, sugarcane, polyploidy, hybridization, founding ancestral genome, diversity, Saccharum, Ecology, Plant Biology, Forestry Sciences, Plant Biology & Botany
Abstract

Background and aimsModern sugarcane cultivars (Saccharum spp.) are high polyploids, aneuploids (2n = ~12x = ~120) derived from interspecific hybridizations between the domesticated sweet species Saccharum officinarum and the wild species S. spontaneum.MethodsTo analyse the architecture and origin of such a complex genome, we analysed the sequences of all 12 hom(oe)ologous haplotypes (BAC clones) from two distinct genomic regions of a typical modern cultivar, as well as the corresponding sequence in Miscanthus sinense and Sorghum bicolor, and monitored their distribution among representatives of the Saccharum genus.Key resultsThe diversity observed among haplotypes suggested the existence of three founding genomes (A, B, C) in modern cultivars, which diverged between 0.8 and 1.3 Mya. Two genomes (A, B) were contributed by S. officinarum; these were also found in its wild presumed ancestor S. robustum, and one genome (C) was contributed by S. spontaneum. These results suggest that S. officinarum and S. robustum are derived from interspecific hybridization between two unknown ancestors (A and B genomes). The A genome contributed most haplotypes (nine or ten) while the B and C genomes contributed one or two haplotypes in the regions analysed of this typical modern cultivar. Interspecific hybridizations likely involved accessions or gametes with distinct ploidy levels and/or were followed by a series of backcrosses with the A genome. The three founding genomes were found in all S. barberi, S. sinense and modern cultivars analysed. None of the analysed accessions contained only the A genome or the B genome, suggesting that representatives of these founding genomes remain to be discovered.ConclusionsThis evolutionary model, which combines interspecificity and high polyploidy, can explain the variable chromosome pairing affinity observed in Saccharum. It represents a major revision of the understanding of Saccharum diversity.

Published
2021

2. Three founding ancestral genomes involved in the origin of sugarcane

Author

Pompidor, Nicolas, Charron, Carine, Hervouet, Catherine, Bocs, Stéphanie, Droc, Gaëtan, Rivallan, Ronan, Manez, Aurore, Mitros, Therese, Swaminathan, Kankshita, Glaszmann, Jean-Christophe, Garsmeur, Olivier, D'Hont, Angélique, Amélioration génétique et adaptation des plantes méditerranéennes et tropicales (UMR AGAP), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-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), Département Systèmes Biologiques (Cirad-BIOS), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), Peuplements végétaux et bioagresseurs en milieu tropical (UMR PVBMT), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut de Recherche pour le Développement (IRD)-Université de La Réunion (UR)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), University of California [Berkeley] (UC Berkeley), University of California (UC), Illinois State University, Centre de Cooperation Internationale en Recherche Agronomique pour le Developpement (CIRAD), International Consortium for Sugarcane Biotechnology (ICSB), United States Department of Energy (DOE) DE-AC02-05CH11231 / CSP-504319, Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-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), University of California [Berkeley], and University of California

Subjects
Plant Biology & Botany, Plant Biology, AcademicSubjects/SCI01080, F30 - Génétique et amélioration des plantes, diversity, Polyploidy, Variation génétique, sugarcane, founding ancestral genome, Genetics, [SDV.BV]Life Sciences [q-bio]/Vegetal Biology, hybridization, Saccharum spontaneum, Genome, Génome, Saccharum officinarum, Ecology, Diversité génétique (comme ressource), AcademicSubjects/SCI01210, Forestry Sciences, Human Genome, AcademicSubjects/SCI01130, food and beverages, Plant, Genomics, Original Articles, Polyploïdie, Saccharum, Haplotypes, Hybridation interspécifique, Genome, Plant, Biotechnology
Abstract

International audience; Abstract Background and Aims Modern sugarcane cultivars (Saccharum spp.) are high polyploids, aneuploids (2n = ~12x = ~120) derived from interspecific hybridizations between the domesticated sweet species Saccharum officinarum and the wild species S. spontaneum. Methods To analyse the architecture and origin of such a complex genome, we analysed the sequences of all 12 hom(oe)ologous haplotypes (BAC clones) from two distinct genomic regions of a typical modern cultivar, as well as the corresponding sequence in Miscanthus sinense and Sorghum bicolor, and monitored their distribution among representatives of the Saccharum genus. Key Results The diversity observed among haplotypes suggested the existence of three founding genomes (A, B, C) in modern cultivars, which diverged between 0.8 and 1.3 Mya. Two genomes (A, B) were contributed by S. officinarum; these were also found in its wild presumed ancestor S. robustum, and one genome (C) was contributed by S. spontaneum. These results suggest that S. officinarum and S. robustum are derived from interspecific hybridization between two unknown ancestors (A and B genomes). The A genome contributed most haplotypes (nine or ten) while the B and C genomes contributed one or two haplotypes in the regions analysed of this typical modern cultivar. Interspecific hybridizations likely involved accessions or gametes with distinct ploidy levels and/or were followed by a series of backcrosses with the A genome. The three founding genomes were found in all S. barberi, S. sinense and modern cultivars analysed. None of the analysed accessions contained only the A genome or the B genome, suggesting that representatives of these founding genomes remain to be discovered. Conclusions This evolutionary model, which combines interspecificity and high polyploidy, can explain the variable chromosome pairing affinity observed in Saccharum. It represents a major revision of the understanding of Saccharum diversity.

Published
2020

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