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HbCIPK2, a novel CBL-interacting protein kinase from halophyte Hordeum brevisubulatum, confers salt and osmotic stress tolerance

文献类型： 外文期刊

作者： Li, Ruifen 1 ; Zhang, Junwen 1 ; Wu, Guangyu 1 ; Wang, Hongzhi 1 ; Chen, Yajuan 1 ; Wei, Jianhua 1 ;

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

关键词： CIPK;K plus homeostasis;salt tolerance

期刊名称：PLANT CELL AND ENVIRONMENT （ 影响因子：7.228； 五年影响因子：7.791 ）

ISSN： 0140-7791

年卷期： 2012 年 35 卷 9 期

页码：

收录情况： SCI

摘要： Protein kinases play an important role in regulating the response to abiotic stress in plant. CIPKs are plant-specific signal transducers, and some members have been identified. However, the precise functions of novel CIPKs still remain unknown. Here we report that HbCIPK2 is a positive regulator of salt and osmotic stress tolerance. HbCIPK2 was screened out of the differentially expressed fragments from halophyte Hordeum brevisubulatum by cDNA-AFLP technique, and was a single-copy gene without intron. Expression of HbCIPK2 was increased by salt, drought and ABA treatment. HbCIPK2 is mainly localized to the plasma membrane and nucleus. Ectopic expression of 35S:HbCIPK2 not only rescued the salt hypersensitivity in Arabidopsis mutant sos2-1, but also enhanced salt tolerance in Arabidopsis wild type, and exhibited tolerance to osmotic stress during germination. The HbCIPK2 contributed to the ability to prevent K+ loss in root and to accumulate less Na+ in shoot resulting in K+/Na+ homeostasis and protection of root cell from death, which is consistent with the gene expression profile of HbCIPK2-overexpressing lines. These findings imply possible novel HbCIPK2-mediated salt signalling pathways or networks in H. brevisubulatum.

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