A Novel Transcriptional Regulator HbERF6 Regulates the HbCIPK2-Coordinated Pathway Conferring Salt Tolerance in Halophytic Hordeum brevisubulatum

文献类型： 外文期刊

第一作者： Jiang, Ying

作者： Jiang, Ying;Zhang, Haiwen;Li, Yang;Chang, Congcong;Wang, Yunxiao;Feng, Hao;Li, Ruifen;Jiang, Ying;Zhang, Haiwen;Feng, Hao;Li, Ruifen;Li, Yang;Chang, Congcong;Wang, Yunxiao

作者机构：

关键词： Hordeum brevisubulatum; salt tolerance; transcription factor; CIPK; halophyte

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：6.627； 五年影响因子：7.255 ）

ISSN： 1664-462X

年卷期： 2022 年 13 卷

页码：

收录情况： SCI

摘要： Halophytic Hordeum brevisubulatum is a perennial grass which has evolved many distinctive salt-adaptive mechanisms. Our previous studies indicated it could thrive under salt stress through maintaining better K C and Na C homeostasis. Stressresponsive HbCIPK2 can phosphorylate KC channel HbVGKC1 and NaC transporter HbSOS1L to prevent NaC accumulation and KC reduction, hence pathway was not detected in glycophytic plants. In this study, we cloned the inducible promoter of HbCIPK2 by genome-walking, and identified a novel transcriptional regulator HbERF6 through yeast one-hybrid screening. HbERF6 functioned as a transcription factor which can bind to the GCC-box of the HbCIPK2 promoter to activate its expression. HbERF6 transgenic lines in Arabidopsis improved salt tolerance compared with wild type, and especially induced AtCIPK24 (SOS2) expression, resulting in KC /NaC homeostasis to enhance salt tolerance. All the results confirmed the inducible function of HbERF6 for CIPK genes during salt tolerance. This regulatory network that integrates transcriptional regulation and post-translation modification will unravel a novel salt stress-responsive mechanism, highlighting the value and utilization of the halophytic resource.

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