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The divergence of brassinosteroid sensitivity between rice subspecies involves natural variation conferring altered internal auto-binding of OsBSK2

文献类型： 外文期刊

作者： Yin, Wenchao 1 ; Li, Lulu 1 ; Yu, Zhikun 1 ; Zhang, Fan 1 ; Liu, Dapu 1 ; Wu, Hongkai 3 ; Niu, Mei 1 ; Meng, Wenjing 1 ; Zhang, Xiaoxing 1 ; Dong, Nana 1 ; Yang, Yanzhao 1 ; Liu, Jihong 1 ; Liu, Yongqiang 3 ; Zhang, Guoxia 3 ; Xu, Jianlong 1 ; Wang, Shimei 2 ; Chu, Chengcai 3 ; Qian, Qian 1 ; Tong, Hongning 1 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Crop Sci, Natl Key Facil Crop Gene Resources & Genet Improv, Beijing 100081, Peoples R China

2.Anhui Acad Agr Sci, Rice Res Inst, Hefei 230001, Peoples R China

3.Chinese Acad Sci, Innovat Acad Seed Design, Inst Genet & Dev Biol, State Key Lab Plant Genom, Beijing 100101, Peoples R China

关键词： brassinosteroid; divergence; grain shape; natural variation; rice

期刊名称：JOURNAL OF INTEGRATIVE PLANT BIOLOGY （ 影响因子：9.106； 五年影响因子：8.241 ）

ISSN： 1672-9072

年卷期：

页码：

收录情况： SCI

摘要： Japonica/geng and indica/xian are two major rice (Oryza sativa) subspecies with multiple divergent traits, but how these traits are related and interact within each subspecies remains elusive. Brassinosteroids (BRs) are a class of steroid phytohormones that modulate many important agronomic traits in rice. Here, using different physiological assays, we revealed that japonica rice exhibits an overall lower BR sensitivity than indica. Extensive screening of BR signaling genes led to the identification of a set of genes distributed throughout the primary BR signaling pathway with divergent polymorphisms. Among these, we demonstrate that the C38/T variant in BR Signaling Kinase2 (OsBSK2), causing the amino acid change P13L, plays a central role in mediating differential BR signaling in japonica and indica rice. OsBSK2(L13) in indica plays a greater role in BR signaling than OsBSK2(P13) in japonica by affecting the auto-binding and protein accumulation of OsBSK2. Finally, we determined that OsBSK2 is involved in a number of divergent traits in japonica relative to indica rice, including grain shape, tiller number, cold adaptation, and nitrogen-use efficiency. Our study suggests that the natural variation in OsBSK2 plays a key role in the divergence of BR signaling, which underlies multiple divergent traits between japonica and indica.

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