State Key Laboratory of Plant Physiology and Biochemistry;
College of Biological Sciences;
China Agricultural University;
Beijing;
100193 China;
Institute of Plant Stress Biology;
Collaborative Innovation Center of Crop Stress Biology;
Henan University;
Kaifeng;
475001 China;
Arabidopsis; feedback loop; freezing stress; protein kinase OST1; protein phosphatases PP2CG1/2;