Effect of triadimefon on anti-oxidative enzymes activity in cucumber cotyledons

During the senescence of cucumber (Cucumis sativus L.) cotyledons, declined activities of superoxide dismutase (SOD), catalase (CAT) and ascorbate-peroxidase (ASA-POD) were observed, but peroxidase (POD) activity was observed increasing. Triadimefon at the concentration of 20 mg/L promoted the activities of POD. On the other hand, the levers of malondialdehyde (MDA) were increased and triadimefon treatment decreased the content of MDA. These results suggested that triadimefon retarded the senescence of cucumber cotyledons by reducing the level of membrane lipid peroxidation.