Contributors: 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; 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); Département Systèmes Biologiques (Cirad-BIOS); Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad); Génomique métabolique (UMR 8030); Genoscope - Centre national de séquençage Evry (GENOSCOPE); Université Paris-Saclay-Direction de Recherche Fondamentale (CEA) (DRF (CEA)); Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Direction de Recherche Fondamentale (CEA) (DRF (CEA)); Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université d'Évry-Val-d'Essonne (UEVE)-Centre National de la Recherche Scientifique (CNRS); Institut de Biologie François JACOB (JACOB); Direction de Recherche Fondamentale (CEA) (DRF (CEA)); Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA); The Alliance of Bioversity International and International Center for Tropical Agriculture (CIAT) Belgique; Alliance of Bioversity International and the International Center for Tropical Agriculture (CIAT) Rome (Alliance); Consultative Group on International Agricultural Research CGIAR (CGIAR)-Consultative Group on International Agricultural Research CGIAR (CGIAR); Laboratoire de Bioinformatique pour la Génomique et la Biodiversité (LBGB); Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université d'Évry-Val-d'Essonne (UEVE)-Centre National de la Recherche Scientifique (CNRS)-Genoscope - Centre national de séquençage Evry (GENOSCOPE); This work was supported by the France Génomique (ANR-10-INBS-0009) project DYNAMO, the Centre de coopération Internationale en Recherche Agronomique pour le Développement (CIRAD) and the Agropolis Fondation (ID 1504-006) ‘GenomeHarvest’ project through the French Investissements d’Avenir program (Labex Agro: ANR- 10-LABX-0001).; ANR-10-INBS-0009,France Génomique,Organisation et montée en puissance d'une Infrastructure Nationale de Génomique(2010); ANR-10-LABX-0001,AGRO,Agricultural Sciences for sustainable Development(2010)
نبذة مختصرة : International audience ; Background and Aims: Cultivated bananas resulted from inter(sub)specific hybridizations involving Musa species and subspecies (M. acuminata subspecies, M. schizocarpa, M. balbisiana) and the subsequent selection, centuries ago, of hybrids with parthenocarpic, seedless fruits. Cultivars have low fertility and are vegetatively propagated, forming groups of somaclones. Relatively few of them, mainly triploids, are grown on a large scale and characterization of their parental relationships may be useful for breeding strategies. Here we investigate parental relationships and gamete-type contributions among diploid and polyploid banana cultivars.Methods: We used SNP genotyping data from whole-genome sequencing of 178 banana individuals, including 111 cultivars, 55 wild bananas and 12 synthetic F1 hybrids. We analysed the proportion of SNP sites in accordance with direct parentage with a global statistic and along chromosomes for selected individuals.Key Results: We characterized parentage relationships for 7 diploid cultivars, 11 triploid cultivars and 1 tetraploid cultivar. Results showed that both diploid and triploid cultivars could have contributed gametes to other banana cultivars. Diploids may have contributed 1x or 2x gametes and triploids 1x to 3x gametes. The Mchare diploid cultivar group, nowadays only found in East Africa, was found as parent of two diploid and eight triploid cultivars. In five of its identified triploid offspring, corresponding to main export or locally popular dessert bananas, Mchare contributed a 2x gamete with full genome restitution without recombination. Analyses of remaining haplotypes in these Mchare offspring suggested ancestral pedigree relationships between different interspecific banana cultivars.Conclusions: The current cultivated banana resulted from different pathways of formation, with implication of recombined or un-recombined unreduced gametes produced by diploid or triploid cultivars. Identification of dessert banana’s parents and the types of ...
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