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Emerging crosstalk between two signaling pathways coordinates K+ and Na+ homeostasis in the halophyte Hordeum brevisubulatum

文献类型： 外文期刊

作者： Zhang, Haiwen 1 ; Feng, Hao 1 ; Zhang, Junwen 3 ; Ge, Rongchao 4 ; Zhang, Liyuan 1 ; Wang, Yunxiao 1 ; Li, Legong 5 ; Wei 1 ;

作者机构： 1.Beijing Acad Agr & Forestry Sci, Beijing Agrobiotechnol Res Ctr, Beijing 100097, Peoples R China

2.Beijing Key Lab Agr Genet Resources & Biotechnol, Beijing 100097, Peoples R China

3.Capital Med Univ, Beijing Tiantan Hosp, Beijing Neurosurg Inst, Brain Tumor Res Ctr, Beijing 100050, Peoples R China

4.Hebei Normal Univ, Coll Life Sci, Shijiazhuang 050024, Hebei, Peoples R China

5.Capital Normal Univ, Coll Life Sci, Beijing Key Lab Plant Gene Resources & Biotechnol, Beijing 100048, Peoples R China

关键词： CBL-CIPK complex; halophyte; Hordeum brevisubulatum; K+/Na+ homeostasis; salinity; signaling pathway; signal swiTch

期刊名称：JOURNAL OF EXPERIMENTAL BOTANY （ 影响因子：6.992； 五年影响因子：7.86 ）

ISSN： 0022-0957

年卷期： 2020 年 71 卷 14 期

页码：

收录情况： SCI

摘要： K+/Na+ homeostasis is the primary core response for plant to tolerate salinity. Halophytes have evolved novel regulatory mechanisms to maintain a suitable K+/Na+ ratio during long-term adaptation. The wild halophyte Hordeum brevisubulatum can adopt efficient strategies to achieve synergistic levels of K+ and Na+ under high salt stress. However, little is known about its molecular mechanism. Our previous study indicated that HbCIPK2 contributed to prevention of Na+ accumulation and K+ reduction. Here, we further identified the HbCIPK2-interacting proteins including upstream Ca2+ sensors, HbCBL1, HbCBL4, and HbCBL10, and downstream phosphorylated targets, the voltage-gated K+ channel HbVGKC1 and SOS1-like transporter HbSOS1L. HbCBL1 combined with HbCIPK2 could activate HbVGKC1 to absorb K+, while the HbCBL4/10-HbCIPK2 complex modulated HbSOS1L to exclude Na+. This discovery suggested that crosstalk between the sodium response and the potassium uptake signaling pathways indeed exists for HbCIPK2 as the signal hub, and paved the way for understanding the novel mechanism of K+/Na+ homeostasis which has evolved in the halophytic grass.

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