Abstract: Select two kinds of Chinese Yam(Dioscorea opposite Thunb.)as experimental materials,set up five periods from seedling stage to harvest time,in order to study changes of the enzyme activity and the endogenous hormone content of tuber in two kinds of Chinese Yam.The result shows：The amylase activity and the starch phosphorylase activity in tuber will become lower in resting stage,and the activity gradually rise with the relief of dormancy.The POD activity and the PPO activity are higher in deeper resting stage,but the POD activity and the PPO activity decrease rapidly with the relief of dormancy.The ABA content in tuber of Chinese Wm(Dioscorea opposite Thunb.)will be decreased with the dormancy process advancing,but the content of GA3,IAA and ZRwell as the proportion of GA3/ ABA,IAA/ABA will be increasing,the ZR content slow vary.Based on the changes of the enzymatic activity and the endogenous hormones content and proportion,it can be inferred that the dormancy will cease after storing 60 days and basically cease after about storing 150 days,which is thought to be the transition period from dormancy to germination. During this period,apply some proper consistency over the cut tuber,or pre-heat it in a short term,SO that to shorten and broken the dormancy.

Key words: Chinese Yam(Dioscorea opposite Thunb．), Enzyme activity, Endogenous hormones

CLC Number: 

• S632.1