Journal
NATURE PLANTS
Volume 5, Issue 8, Pages 810-821Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41477-019-0452-6
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Funding
- earmarked fund for the National Key Research and Development Programme [2018YFD1000200]
- Modern Agro-industry Technology Research System [CARS-32]
- National Nonprofit Institute Research Grant of CATAS [1630052012012]
- National Natural Science Foundation of China [31872161]
- Natural Science Foundation of Hainan Province [2019CXTD412]
- Central Public-interest Scientific Institution Basal Research Fund for CATAS [1630052017018, 1630052019024, 1630052016005, 1630052016006, 1630052017017]
- CGIAR Research Programme on Roots, Tubers and Bananas
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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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