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Published on May 25, 2007; 10.1104/pp.107.101295

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Received April 19, 2007
Accepted May 22, 2007

Characterization of Stress-Responsive CBL-Interacting Protein Kinase Genes in Rice for Stress Tolerance Improvement

Yong Xiang , Yuemin Huang , and Lizhong Xiong *

National Center of Plant Gene Research (Wuhan), National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, 430070, China

* Corresponding author; email: lizhongx{at}mail.hzau.edu.cn.

Plants respond to adverse environment by initiating a series of signaling processes, which often involves diverse protein kinases including calcineurin B-like protein-interacting protein kinases (CIPKs). In this study, putative CIPK genes (OsCIPK01-30) in rice genome were surveyed for their transcriptional responses to various abiotic stresses. The results showed that 20 OsCIPK genes were differentially induced by at least one of the stresses including drought, salinity, cold, polyethylene glycol (PEG), and abscisic acid (ABA) treatment. Most of the genes induced by drought or salt stress were also induced by ABA treatment but not by cold. A few CIPK genes containing none of the reported stress-responsive cis-elements in their promoter regions were also induced by multiple stresses. To prove that some of these stress-responsive OsCIPK genes are potentially useful for stress tolerance improvement, three CIPK genes (OsCIPK03, OsCIPK12, and OsCIPK15) were over-expressed in japonica rice Zhonghua 11. Transgenic plants over-expressing the transgene OsCIPK03, OsCIPK12, and OsCIPK15 showed significantly improved tolerance to cold, drought and salt stress respectively. Under cold and drought stresses, OsCIPK03- and OsCIPK12-overexpressed transgenic plants accumulated significantly higher contents of proline and soluble sugars than wild type did. Putative proline synthetase and transporter genes had significantly higher expression level in the transgenic plants than in wild type. The differentially induced expression of OsCIPK genes by different stresses and the examples of improved stress tolerance of the OsCIPK transgenic rice suggest that rice CIPK genes have diverse roles in different stress responses and some of them may possess potential usefulness in stress tolerance improvement of rice.




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