不同抗寒性茶树品种秋季新梢的生理特性研究

为了探明茶树品种的抗寒机理，在前期抗寒性茶树品种筛选研究的基础上，选择强抗寒性、中抗寒性和弱抗寒性茶树品种各2份，分别比较了其秋季新梢中过氧化氢酶(CAT)、过氧化物酶(POD)、超氧化物歧化酶(SOD)和多酚氧化酶(PPO)等抗寒性相关酶的活性，并对可溶性蛋白质、可溶性糖、丙二醛含量等生理生化特性进行测定。结果表明，强抗寒性茶树品种的秋季新梢POD活性和可溶性糖含量较高，而弱抗寒性的茶树品种POD活性和可溶性糖含量较低。可溶性蛋白质含量高低与抗寒性强弱有一定关系，CAT、SOD和PPO活性及丙二醛含量高低与抗寒性强弱之间无明显规律可循。因此，POD活性和可溶性糖含量高低可以作为判断茶树品种或资源新梢抗寒性强弱的鉴定指标。

Study on physiological characters of new shoot in different cold resistant tea varieties in autumn#br#

In order to investigate the mechanism of cold resistance， six varieties with three levels of cold resistance were selected as the experimental materials. The activities of four enzymes， CAT， POD， SOD and PPO， as well as the contents of soluble protein， soluble sugar and MDA were determined in new shoot of the different cold resistant tea varieties in autumn. The results showed that the activities of POD and the content of soluble sugar were much higher in the varieties with high resistance; the content of soluble protein was associated with the cold resistance， while the cold resistance was not related with the activities of the CAT， SOD and PPO， and the content of MDA. Taken together， the activities of POD， and contents of soluble sugar could be used as indices to detect the cold resistance of tea varieties．