Paleoploidization events in the Musa (banana) lineage

Garsmeur Olivier, Denoeud France, Baurens Franc-Christophe, Aury Jean-Marc, Wincker Patrick, D'Hont Angélique. 2013. Paleoploidization events in the Musa (banana) lineage. In : Polyploïde et cytogénétique, Rennes, France, 16-17 mai 2013. s.l. : s.n., 1 p. Polyploïdie et cytogénétique, Rennes, France, 16 Mai 2013/17 Mai 2013.

Résumé : Bananas (Musa spp.) are giant perennial monocotyledonous herbs of the order Zingiberales, a sister group to the well-studied Poales. Cultivars are mainly triploid, from inter(sub)specific origin and clonally propagated. We sequenced the genome of a Musa acuminata doubled-haploid genotype (Pahang-HD) providing the first monocotyledon high-continuity whole-genome sequence reported outside Poales. The analysis of the genome revealed three rounds of whole genome duplications (WGD), denoted as alpha, beta and gamma (from the most recent event to the oldest). Based on Ks analyses and synteny relationships, twelve beta Musa ancestral blocks were constructed, representing the ancestral genome before alpha and beta duplications. Comparative genomics and phylogenetic approaches revealed that these three WGDs occurred in the Musa lineage independently of those described in the Poales lineage and the one that we detected in the Arecales lineage. Following WGDs, that are particularly frequent in the flowering plant lineages, most duplicated genes are deleted by intrachromosomal recombination, a process referred to as fractionation. We are currently analyzing the fractionation pattern following the Musa polyploidization events. Finally, this Musa reference sequence represents an invaluable reference for studying monocot evolution and associated genomic changes.

Classification Agris : F30 - Génétique et amélioration des plantes
F60 - Physiologie et biochimie végétale

Auteurs et affiliations

• Garsmeur Olivier, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0001-8869-3689
• Denoeud France, CEA (FRA)
• Baurens Franc-Christophe, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0002-5219-8771
• Aury Jean-Marc, Institut de génomique (FRA)
• Wincker Patrick, Institut de génomique (FRA)
• D'Hont Angélique, CIRAD-BIOS-UMR AGAP (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/569844/)

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