The MKK3-MPK7 cascade phosphorylates ERF4 and promotes its rapid degradation to release seed dormancy in Arabidopsis

文献类型： 外文期刊

第一作者： Chen, Xi

作者： Chen, Xi;Li, Qiujia;Ding, Ling;Shan, Siyao;Jiang, Wenhui;Zhang, Liying;Ding, Xiali;Zhang, Jun;Li, Chunli;Xiang, Yong;Zhang, Shengnan;Xiong, Xiong;Lian, Yiming;Kong, Xiuqin;Zhao, Bo;Luo, Ying;Soppe, Wim J. J.

作者机构：

关键词： seed dormancy; dormancy breaking; seed germination; MKK3; MPK7; ERF4; phosphorylation; protein degradation; DNA binding

期刊名称：MOLECULAR PLANT （ 影响因子：27.5； 五年影响因子：22.6 ）

ISSN： 1674-2052

年卷期： 2023 年 16 卷 11 期

页码：

收录情况： SCI

摘要： Seeds establish dormancy to delay germination until the arrival of a favorable growing season. In this study, we identify a fate switch comprised of the MKK3-MPK7 kinase cascade and the ethylene response factor ERF4 that is responsible for the seed state transition from dormancy to germination. We show that dormancy-breaking factors activate the MKK3-MPK7 module, which affects the expression of some a-EXPANSIN (EXPA) genes to control seed dormancy. Furthermore, we identify a direct downstream substrate of this module, ERF4, which suppresses the expression of these EXPAs by directly binding to the GCC boxes in their exon regions. The activated MKK3-MPK7 module phosphorylates ERF4, leading to its rapid degradation and thereby releasing its inhibitory effect on the expression of these EXPAs. Collectively, our work identifies a signaling chain consisting of protein phosphorylation, degradation, and gene transcription , by which the germination promoters within the embryo sense and are activated by germination signals from ambient conditions.

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