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Open AccessArticle

ZmCIPK21, A Maize CBL-Interacting Kinase, Enhances Salt Stress Tolerance in Arabidopsis thaliana

College of Agriculture and Biotechnology, China Agricultural University, No. 2 Yuanmingyuan West Road, Beijing 100094, China
Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, No. 12 Zhongguancun South Street, Beijing 100081, China
Institute of Nuclear Technology and Biotechnology, Xinjiang Academy of Agricultural Sciences, No. 403 Nanchang Road, Urumqi 830091, China
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2014, 15(8), 14819-14834;
Received: 26 May 2014 / Revised: 7 August 2014 / Accepted: 11 August 2014 / Published: 22 August 2014
(This article belongs to the Special Issue Signalling Molecules and Signal Transduction in Cells 2014)
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. View Full-Text
Keywords: CIPK; stress; salt tolerance; Arabidopsis CIPK; stress; salt tolerance; Arabidopsis
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Chen, X.; Huang, Q.; Zhang, F.; Wang, B.; Wang, J.; Zheng, J. ZmCIPK21, A Maize CBL-Interacting Kinase, Enhances Salt Stress Tolerance in Arabidopsis thaliana. Int. J. Mol. Sci. 2014, 15, 14819-14834.

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