Histidine kinase MHZ1/OsHK1 interacts with ethylene receptors to regulate root growth in rice

文献类型： 外文期刊

第一作者： Zhao, He

作者： Zhao, He;Duan, Kai-Xuan;Yin, Cui-Cui;Hu, Yang;Tao, Jian-Jun;Huang, Yi-Hua;Cao, Wu-Qiang;Chen, Hui;Yang, Chao;He, Si-Jie;Zhang, Wan-Ke;Chen, Shou-Yi;Zhang, Jin-Song;Zhao, He;Duan, Kai-Xuan;Hu, Yang;Huang, Yi-Hua;Cao, Wu-Qiang;Chen, Hui;Zhang, Jin-Song;Ma, Biao;Wan, Xiang-Yuan;Zhang, Zhi-Guo;Lu, Tie-Gang

作者机构：

期刊名称：NATURE COMMUNICATIONS （ 影响因子：14.919； 五年影响因子：15.805 ）

ISSN： 2041-1723

年卷期： 2020 年 11 卷 1 期

页码：

收录情况： SCI

摘要： Ethylene plays essential roles during adaptive responses to water-saturating environments in rice, but knowledge of its signaling mechanism remains limited. Here, through an analysis of a rice ethylene-response mutant mhz1, we show that MHZ1 positively modulates root ethylene responses. MHZ1 encodes the rice histidine kinase OsHK1. MHZ1/OsHK1 is autophosphorylated at a conserved histidine residue and can transfer the phosphoryl signal to the response regulator OsRR21 via the phosphotransfer proteins OsAHP1/2. This phosphorelay pathway is required for root ethylene responses. Ethylene receptor OsERS2, via its GAF domain, physically interacts with MHZ1/OsHK1 and inhibits its kinase activity. Genetic analyses suggest that MHZ1/OsHK1 acts at the level of ethylene perception and works together with the OsEIN2-mediated pathway to regulate root growth. Our results suggest that MHZ1/OsHK1 mediates the ethylene response partially independently of OsEIN2, and is directly inhibited by ethylene receptors, thus revealing mechanistic details of ethylene signaling for root growth regulation.

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