数字农科院2.0

Histidine Kinase Mhz1/Oshk1 Interacts With Ethylene Receptors To Regulate Root Growth In Rice

文献类型： 外文期刊

作者： Zhao, H; Duan, KX; Ma, B; Yin, CC; Hu, Y; Tao, JJ; Huang, YH; Cao, WQ; Chen, H; Yang, C; Zhang, ZG; He, SJ; Zhang, WK; Wan, XY; Lu, TG; Chen, SY; Zhang, JS

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期刊名称： NATURE COMMUNICATIONS

ISSN： 2041-1723

年卷期： 2020 年 11 卷 1 期

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收录情况： JCR（2021版）

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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