期刊
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
卷 15, 期 8, 页码 14819-14834出版社
MDPI AG
DOI: 10.3390/ijms150814819
关键词
CIPK; stress; salt tolerance; Arabidopsis
资金
- National High-tech Program of China [2012AA10A306]
- National Natural Science Foundation of China [31330056]
- National Transgenic Research Program [2014ZX08003-004]
- Xinjiang High-Tech Research Projects [201011109]
Salt stress represents an increasing threat to crop growth and yield in saline soil. In this study, we identified a maize calcineurin B-like protein-interacting protein kinase (CIPK), ZmCIPK21, which was primarily localized in the cytoplasm and the nucleus of cells and displayed enhanced expression under salt stress. Over-expression of ZmCIPK21 in wild-type Arabidopsis plants increased their tolerance to salt, as supported by the longer root lengths and improved growth. The downstream stress-response genes, including dehydration-responsive element-binding (DREB) genes were also activated in transgenic plants over-expressing ZmCIPK21. In addition, introduction of the transgenic ZmCIPK21 gene into the Arabidopsis mutant cipk1-2 rescued the salt-sensitive phenotype under high salt stress. Measurement of Na+ and K+ content in transgenic plants showed that over-expression of ZmCIPK21 decreased accumulation of Na+ and allowed retention of relatively high levels of K+, thereby enhancing plant tolerance to salt conditions.
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