激素被认为是抗寒基因表达的启动因子。现在已经发现,植物的生长和抗寒锻炼与其体内赤霉素和脱落酸含量的消长动态密切相关。在植物旺盛生长时,赤霉素含最高;当植物在自然秋季低温或人工低温下进行抗寒锻炼时,赤霉素含量减少,脱落酸含量增加。在小麦、油菜、苜蓿、马铃薯、梣叶槭等植物的抗寒锻炼过程中均观测到这种动态。因此近些年来,人们试图 Hormones are thought to be the initiators of cold-resistant gene expression. It has now been found that plant growth and cold resistance are closely related to the dynamics of the growth and decay of gibberellins and abscisic acid in plants. When plants grow vigorously, gibberellin is the highest; when the plants are cold-resistant during the natural autumn or artificial low temperature, the gibberellin content decreases and the abscisic acid content increases. This dynamic was observed during the cold-resistance training of plants such as wheat, rapeseed, alfalfa, potato and Acer Asiaticum. So in recent years, people tried