Control of grain size in rice by TGW3 phosphorylation of OsIAA10 through potentiation of OsIAA10-OsARF4-mediated auxin signaling

文献类型： 外文期刊

第一作者： Ma, Ming

作者： Ma, Ming;Shen, Shao-Yan;Bai, Chen;Wang, Wei-Qing;Feng, Xiao-Hui;Song, Xian-Jun;Ma, Ming;Shen, Shao-Yan;Bai, Chen;Wang, Wei-Qing;Feng, Xiao-Hui;Song, Xian-Jun;Ying, Jie-Zheng;Song, Xian-Jun

作者机构：

期刊名称：CELL REPORTS （ 影响因子：8.8； 五年影响因子：9.9 ）

ISSN： 2211-1247

年卷期： 2023 年 42 卷 3 期

页码：

收录情况： SCI

摘要： Grain size is a key component of grain yield and quality in crops. Several core players of auxin signaling have been revealed to modulate grain size; however, to date, few genetically defined pathways have been reported, and whether phosphorylation could boost degradation of Aux/IAA proteins is uncertain. Here, we show that TGW3 (also called OsGSK5) interacts with and phosphorylates OsIAA10. Phosphorylation of OsIAA10 facilitates its interaction with OsTIR1 and subsequent destabilization, but this modification hinders its interaction with OsARF4. Our genetic and molecular evidence identifies an OsTIR1-OsIAA10-OsARF4 axis as key for grain size control. In addition, physiological and molecular studies suggest that TGW3 mediates the brassinosteroid response, the effect of which can be relayed through the regulatory axis. Collectively, these findings define a auxin signaling pathway to regulate grain size, in which phosphorylation of OsIAA10 enhances its proteolysis and potentiates OsIAA10-OsARF4-mediated auxin signaling.

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