The Effect of Water Stress on the Activity of Antioxidant Ezymes of Solanum tuberosum L.

Under water stress by polyethylene glycol-6000(PEG-6000),the changes of MDA content and activity of antioxidant ezymes(CAT,POD and SOD)was analyzed by control(0% PEG)and treatment(10% PEG)on Longshu No.3 and Atlantic of the solanum tuberosum L.tissue-cultured seedling.The results showed that,the activities of SOD,POD,CAT and MDA content of potato increased during the prophase of water stress;they attain peak value seperately after certain extent time,subsequently MDA content and activity of antioxidant enzymes such as CAT,POD,SOD began to declined;after water stress had been released,the activities of CAT,POD,and SOD ascended again,but MDA content declined.The two cultivars expressed different sensitivity to water stress during the whole process of stress.