Insights into the genome of Musa (banana), a giant herb bearing fleshy fruits

D'Hont Angélique, Piffanelli Pietro, Lescot Magali, Town Christopher, Leebens-Mack Jim, Blanc Guillaume, Souza Manoel, Pappas Junior Georgios, Roux Nicolas, Glaszmann Jean-Christophe, Sasaki Takuji. 2009. Insights into the genome of Musa (banana), a giant herb bearing fleshy fruits. In : Proceedings of the 9th International Plant Molecular Biology Congress, October 25-30, 2009, St Louis, USA. by Pierre Gustafon (ed.). Lancaster : DEStech Publications, Résumé, 219. ISBN 978-1-60595-018-1 IPMB Congress. 9, St Louis, États-Unis, 25 Octobre 2009/30 Octobre 2009.

Résumé : Musa species, comprising dessert and cooking bananas, contribute the fourth most important food crop in developing countries. They are monocotyledons of the Zingiberales order and the Musaceae family. We have compared genomic sequences in two Musa species with orthologous regions in the rice genome. We produced 1.4 Mb of Musa sequence from 13 BAC clones and annotated and analyzed them along with four previously sequenced BACs. The 443 predicted genes revealed that Zingiberales genes share GC content and distribution characteristics with both eudicot and Poaceae. Comparison with rice revealed microsyntenic regions that have persisted since the divergence of the Commelinid orders Poales and Zingiberales at least 117 Mya. The previously hypothesized large-scale duplication event in the common ancestor of major cereal lineages within the Poaceae was verified. The distribution of divergence time among Musa-Zingiber (Zingiberaceae, Zingiberales) orthologs and paralogs provide strong evidence for a large-scale duplication in the Musa lineage after its divergence from the Zingiberaceae approximately 61 Mya. Comparisons between M. acuminata and M. balbisiana revealed highly conserved genome structure and indicated that these genomes diverged circa 4.6 Mya. The sequencing of the entire genome of a M. acuminata dihaploid is in progress and will enable whole genome comparisons, thus refining the above inferences. It will provide a new foundation for locating genes of agricultural interest and support improvement of banana and plantain varieties.

Classification Agris : F30 - Génétique et amélioration des plantes
F70 - Taxonomie végétale et phytogéographie

Auteurs et affiliations

• D'Hont Angélique, CIRAD-BIOS-UMR DAP (FRA)
• Piffanelli Pietro
• Lescot Magali
• Town Christopher, The J. Craig Venter Institute (USA)
• Leebens-Mack Jim, University of Georgia (USA)
• Blanc Guillaume, CNRS (FRA)
• Souza Manoel, EMBRAPA (BRA)
• Pappas Junior Georgios, UCB (BRA)
• Roux Nicolas, Bioversity International (FRA)
• Glaszmann Jean-Christophe, CIRAD-BIOS-DIR (FRA) ORCID: 0000-0001-9918-875X
• Sasaki Takuji, NIAS (JPN)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/555757/)

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