Effects of mechanical damage on the activites of antioxidant enzymes in fuji apples

The changes in the activities of superoxide dismutase (SOD), catalase (CAT), peroxidase (POD), ascorbate peroxidase (APX), glutathione reductase (GR) and the contents of ascorbic acid (AsA), reduced glutathione (GSH) of the wounded site of Fuji apples by mechanical damage during storage at 5 ℃ and 18 ℃ were investigated. The results showed that the activities of SOD and APX of the injured fruit compared with that of the control decreased gradually during prophase storage, the activities of GR decreased rapidly then increased,the activities of CAT and POD increased gradually;then the contents of GSH and AsA showed the same change as the activities of GR. With extension of storage, the activities of antioxidant enzyme and the contents of antioxidant showed increasing and decreasing repeatly, and at lower temperature, the various physiological changes were slower and the activities and contents were higher. It showed that mechanical damage obviously induced the changes of antioxidant enzyme and antioxidant to improve the capacity for the injured tissue to self-repaired by damage, and the ability of self-repaired obtained from lower temperature was more powerful.