Musa balbisiana genome reveals subgenome evolution and functional divergence

Wang Zhuo, Miao Hongxia, Liu Juhua, Xu Biyu, Yao Xiaoming, Xu Chunyan, Zhao Shancen, Fang Xiaodong, Jia Caihong, Wang Jingyi, Zhang Jianbin, Li Jing, Xu Yi, Wang Jiashui, Ma Weihong, Wu Zhixiang, Yu Lili, Yang Yulan, Liu Chun, Guo Yu, Sun Silong, Baurens Franc-Christophe, Martin Guillaume, Salmon Frédéric, Garsmeur Olivier, Yahiaoui Nabila, Hervouet Catherine, Rouard Mathieu, Laboureau Nathalie, Habas Rémy, Ricci Sebastien, Peng Ming, Guo Anping, Xie Jianghui, Li Yin, Ding Zehong, Yan Yan, Tie Weiwei, D'Hont Angélique, Hu Wei, Jin Zhiqiang. 2019. Musa balbisiana genome reveals subgenome evolution and functional divergence. Nature Plants, 5 : 810-821.

https://doi.org/10.1038/s41477-019-0452-6

Article de revue ; Article de recherche ; Article de revue à facteur d'impact

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Quartile : Outlier, Sujet : PLANT SCIENCES

Résumé : Banana cultivars (Musa ssp.) are diploid, triploid and tetraploid hybrids derived from Musa acuminata and Musa balbisiana. We presented a high-quality draft genome assembly of M. balbisiana with 430 Mb (87%) assembled into 11 chromosomes. We identified that the recent divergence of M. acuminata (A-genome) and M. balbisiana (B-genome) occurred after lineage-specific whole-genome duplication, and that the B-genome may be more sensitive to the fractionation process compared to the A-genome. Homoeologous exchanges occurred frequently between A- and B-subgenomes in allopolyploids. Genomic variation within progenitors resulted in functional divergence of subgenomes. Global homoeologue expression dominance occurred between subgenomes of the allotriploid. Gene families related to ethylene biosynthesis and starch metabolism exhibited significant expansion at the pathway level and wide homoeologue expression dominance in the B-subgenome of the allotriploid. The independent origin of 1-aminocyclopropane-1-carboxylic acid oxidase (ACO) homoeologue gene pairs and tandem duplication-driven expansion of ACO genes in the B-subgenome contributed to rapid and major ethylene production post-harvest in allotriploid banana fruits. The findings of this study provide greater context for understanding fruit biology, and aid the development of tools for breeding optimal banana cultivars.

Mots-clés Agrovoc : Musa balbisiana, hybride, génome, fruit (botanique)

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

Champ stratégique Cirad : CTS 1 (2019-) - Biodiversité

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