Effects of Cu on the Physiological Response of Large-leaf Tea Seedling

Experiment was carried out on the influence of copper stress on physiological and biochemical characteristics of large-leaf tea seeding by indoor potted culture. The result indicated that under the stress of copper, chlorophyll content and protective enzymes closely related to the adversity changed with evident relation of dosage/efficiency;when copper concentrations were 0~30 mg/L, chlorophyll content increased first and then decreased. The activities of SOD, CAT and POD went up at the beginning of copper stress, but all decreased as the quantity of copper increasing, while the MDA content increased all the time. It is concluded that low-level copper stress could stimulate the antioxidant enzyme activity in large-leaf tea seeding and raise the chlorophyll content, however, the high concentration of copper stress could increase the superoxide radicals'contents in tea seedling so that the chlorophyll content and antioxidant enzyme activity decreased.