April 21, 2020  |  

Musa balbisiana genome reveals subgenome evolution and functional divergence.

Authors: Wang, Zhuo and Miao, Hongxia and Liu, Juhua and Xu, Biyu and Yao, Xiaoming and Xu, Chunyan and Zhao, Shancen and Fang, Xiaodong and Jia, Caihong and Wang, Jingyi and Zhang, Jianbin and Li, Jingyang and Xu, Yi and Wang, Jiashui and Ma, Weihong and Wu, Zhangyan and Yu, Lili and Yang, Yulan and Liu, Chun and Guo, Yu and Sun, Silong and Baurens, Franc-Christophe and Martin, Guillaume and Salmon, Frederic and Garsmeur, Olivier and Yahiaoui, Nabila and Hervouet, Catherine and Rouard, Mathieu and Laboureau, Nathalie and Habas, Remy and Ricci, Sebastien and Peng, Ming and Guo, Anping and Xie, Jianghui and Li, Yin and Ding, Zehong and Yan, Yan and Tie, Weiwei and D'Hont, Angélique and Hu, Wei and Jin, Zhiqiang

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.

Journal: Nature plants
DOI: 10.1038/s41477-019-0452-6
Year: 2019

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