三唑酮对黄瓜子叶抗氧化酶活力的影响

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

黄瓜子叶衰老过程中超氧物歧化酶 (SOD)、过氧化氢酶 (CAT)和抗坏血酸 -过氧化物酶 (ASA- POD)活性降低 ,而过氧化物酶 (POD)活性升高。 2 0 mg/L三唑酮可明显提高SOD,ASA- POD,CAT活性 ,抑制 POD活性升高。膜脂过氧化产物丙二醛 (MDA)含量在叶片衰老过程中提高 ,三唑酮可降低 MDA含量。表明三唑酮减轻脂质过氧化程度 ,延缓了叶片的衰老。

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 SOD、CAT、ASA POD,while keeping from increasing of the activity 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.