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Published on February 9, 2007; 10.1104/pp.106.094532

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Received December 11, 2006
Accepted February 3, 2007

Overexpression of a R1R2R3 MYB Gene, OsMYB3R-2, Increases Tolerance to Freezing, Drought, and Salt Stress in Transgenic Arabidopsis

Xiaoyan Dai , Yunyuan Xu , Qibin Ma , Wenying Xu , Tai Wang , Yongbiao Xue , and Kang Chong *

Research Center for Molecular and Developmental Biology, Key Laboratory of Photosynthesis and Environmental Molecular Physiology, Institute of Botany, the Chinese Academy of Sciences, Beijing 100093, China; Laboratory of Molecular and Developmental Biology, Institute of Genetics and Developmental Biology, the Chinese Academy of Sciences, Beijing 100080, China; National Center for Plant Gene Research, Beijing 100093, China

* Corresponding author; email: chongk{at}ibcas.ac.cn.

We used a cDNA microarray approach to monitor the expression profile of rice under cold stress and identified 328 cold-regulated genes. Thirteen such genes encoding MYB, homeodomain and zinc finger proteins with unknown functions showed a significant change in expression under 72-h cold stress. Among them, OsMYB3R-2 was selected for further study. Unlike most plant R2R3 MYB transcription factors, OsMYB3R-2 has 3 imperfect repeats in the DNA binding domain, the same as in animal c-MYB proteins. Expression of OsMYB3R-2 was induced by cold, drought, and salt stress. The Arabidopsis transgenic plants overexpressing OsMYB3R-2 showed increased tolerance to cold, drought, and salt stress, and the seed germination of transgenic plants was more tolerant to abscisic acid or NaCl than that of wild type. The expression of some clod-related genes such as DREB2A, COR15a, and RCI2A was increased to a higher level in OsMYB3R-2 overexpressing plants than in wild type. These results suggest that OsMYB3R-2 acts as a master switch in stress tolerance.




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