Freezing is a major environmental stress to the plants growing from subtropical regions to frigid areas,and the plants havesuccessfully evolved the strategy to vurvive the low temperature encountered. In recent years,the cold-adaptation strategy of plants has beenwidely studied at physiological and molecular levels i.e.,there have been certain understandings on the cold signal transduction network,typesand fucntions of cold-induced genes. But the physiological characteristics and survival strategies of chlo...