赤霉素和茉莉酸对WD重复/bHLH/MYB复合体的调控
Regulation of the WD-repeat/bHLH/MYB complex by gibberellin and jasmonate.
作者信息
Tian Haixia, Qi Tiancong, Li Yang, Wang Cuili, Ren Chunmei, Song Susheng, Huang Huang
机构信息
a College of Bioscience and Biotechnology , Hunan Agricultural University , Changsha , P.R. China.
b Tsinghua-Peking Center for Life Sciences , MOE Key Laboratory of Bioinformatics, School of Life Sciences, Tsinghua University , Beijing , P.R. China.
出版信息
Plant Signal Behav. 2016 Aug 2;11(8):e1204061. doi: 10.1080/15592324.2016.1204061.
The phytohormones gibberellin (GA) and jasmonate (JA) regulate various aspects of plant development, growth and defense. Previous studies showed that both DELLA repressors in GA pathway and JA-ZIM domain (JAZ) proteins in JA pathway interact with and repress the WD-repeat/bHLH/MYB transcriptional complex to inhibit trichome initiation, and GA and JA respectively induce DELLAs and JAZs degradation to synergistically enhance trichome formation. In this study, we showed that the DELLA protein RGA and JAZ1 competitively bind to ENHANCER OF GLABRA3 (EGL3), a bHLH component of the WD-repeat/bHLH/MYB complex. GA and JA differently affect the expression and protein stability of the components of the WD-repeat/bHLH/MYB complex, and EGL3 and GL3 repress the expression of JAZ genes as a feedback. The novel findings help to understand the mechanism of the WD-repeat/bHLH/MYB complex in GA/JA-regulated trichome formation.
植物激素赤霉素（GA）和茉莉酸（JA）调节植物发育、生长和防御的各个方面。先前的研究表明，GA途径中的DELLA阻遏物和JA途径中的JA-ZIM结构域（JAZ）蛋白都与WD重复/bHLH/MYB转录复合体相互作用并抑制其活性，从而抑制毛状体起始，并且GA和JA分别诱导DELLA和JAZ降解，以协同增强毛状体形成。在本研究中，我们发现DELLA蛋白RGA和JAZ1竞争性结合WD重复/bHLH/MYB复合体的bHLH组分GLABRA3增强子（EGL3）。GA和JA对WD重复/bHLH/MYB复合体各组分的表达和蛋白质稳定性有不同影响，并且EGL3和GL3作为反馈抑制JAZ基因的表达。这些新发现有助于理解WD重复/bHLH/MYB复合体在GA/JA调节毛状体形成中的机制。
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