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Musa balbisiana genome reveals subgenome evolution and functional divergence

文献类型： 外文期刊

作者： Wang, Zhuo 1 ; Miao, Hongxia 1 ; Liu, Juhua 1 ; Xu, Biyu 1 ; Yao, Xiaoming 3 ; Xu, Chunyan 3 ; Zhao, Shancen 4 ; Fang, Xi 1 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Inst Trop Biosci & Biotechnol, Key Lab Biol & Genet Resources Trop Crops, Haikou, Hainan, Peoples R China

2.China Acad Trop Agr Sci, Haikou Expt Stn, Key Lab Genet Improvement Bananas Hainan Prov, Haikou, Hainan, Peoples R China

3.BGI Shenzhen, BGI Genom, Shenzhen, Peoples R China

4.BGI Shenzhen, BGI Inst Appl Agr, Shenzhen, Peoples R China

5.UMR AGAP, CIRAD, Montpellier, France

6.Univ Montpellier, CIRAD, INRA, Montpellier SupAgro,AGAP, Montpellier, France

7.UMR AGAP, CIRAD, Guadeloupe, France

8.Biovers Int, Montpellier, France

9.UMR BGPI, CIRAD, Montpellier, France

10.Montpellier SupAgro, INRA, CIRAD, BGPI, Montpellier, France

11.Rutgers State Univ, Waksman Inst Microbiol, Piscataway, NJ USA

期刊名称：NATURE PLANTS （ 影响因子：15.793； 五年影响因子：17.349 ）

ISSN： 2055-026X

年卷期： 2019 年 5 卷 8 期

页码：

收录情况： SCI

摘要： 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.

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