Current progresses of researches on plant frost hardiness are summarized. When plants grew under cold condition, the morphological structure, ultrastructure, ingredients of membrane lipids and quantity and types of membrane proteins would be changed. Plant biochemical or physiological changes were caused by genes expression change under cold condition, moreover, the genes had been identified and the means of the genes action had been revealed. Some external hormones＇, such as ABA and PP333, and Ca2＋, can induce the levels of ABA to be enhance...
