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Int. J. Mol. Sci. 2014, 15(8), 14819-14834; doi:10.3390/ijms150814819

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

1
College of Agriculture and Biotechnology, China Agricultural University, No. 2 Yuanmingyuan West Road, Beijing 100094, China
2
Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, No. 12 Zhongguancun South Street, Beijing 100081, China
3
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.
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)
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Abstract

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
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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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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