Telomere-to-telomere genome of the allotetraploid legume Sesbania cannabina reveals transposon-driven subgenome divergence and mechanisms of alkaline stress tolerance

文献类型： 外文期刊

第一作者： Luo, Haofei

作者： Luo, Haofei;Wang, Xiaofei;You, Changqing;Wu, Xuedan;Li, Tong;He, Kaixuan;Ye, Qingtong;Zhao, Qinghua;Deng, Xian;Cao, Xiaofeng;Song, Xianwei;Huang, Gai;Luo, Haofei;Wang, Xiaofei;You, Changqing;Wu, Xuedan;Li, Tong;He, Kaixuan;Ye, Qingtong;Zhao, Qinghua;Deng, Xian;Cao, Xiaofeng;Song, Xianwei;Huang, Gai;Wang, Xiaofei;Lv, Zhiyao;He, Kaixuan;Jia, Yajun;You, Changqing;Ye, Qingtong;Cao, Xiaofeng;Pan, Duofeng;Zhang, Dongmei;Shen, Zhongbao;Zhang, Xiaodong;Zhang, Xiaodong;Zhang, Xiaodong;Liu, Guodao

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关键词： Sesbania cannabina; alkaline stress; telomere-to-telomere genome; legume; green manure; phosphate transporter; allotetraploid

期刊名称：SCIENCE CHINA-LIFE SCIENCES （ 影响因子：9.1； 五年影响因子：7.1 ）

ISSN： 1674-7305

年卷期： 2023 年

页码：

收录情况： SCI

摘要： Alkaline soils pose an increasing problem for agriculture worldwide, but using stress-tolerant plants as green manure can improve marginal land. Here, we show that the legume Sesbania cannabina is very tolerant to alkaline conditions and, when used as a green manure, substantially improves alkaline soil. To understand genome evolution and the mechanisms of stress tolerance in this allotetraploid legume, we generated the first telomere-to-telomere genome assembly of S. cannabina spanning similar to 2,087 Mb. The assembly included all centromeric regions, which contain centromeric satellite repeats, and complete chromosome ends with telomeric characteristics. Further genome analysis distinguished A and B subgenomes, which diverged approximately 7.9 million years ago. Comparative genomic analysis revealed that the chromosome homoeologs underwent large-scale inversion events (>10 Mb) and a significant, transposon-driven size expansion of the chromosome 5A homoeolog. We further identified four specific alkali-induced phosphate transporter genes in S. cannabina; these may function in alkali tolerance by relieving the deficiency in available phosphorus in alkaline soil. Our work highlights the significance of S. cannabina as a green tool to improve marginal lands and sheds light on subgenome evolution and adaptation to alkaline soils.

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