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在 3种不同浓度的NaCl (85mmol·L-1,170mmol·L-1,2 6 0mmol·L-1)胁迫下 ,对毛白杨幼苗的超氧化物歧化酶 (SOD)和过氧化物酶 (POD)活性以及丙二醛 (MDA)含量进行测定 .结果发现 ,在NaCl胁迫 3小时后 ,幼苗SOD和POD活性显著降低 ,随着胁迫时间的延长 ,这两种酶活性降低较缓慢 ,但SOD活性下降程度均较POD小 .在NaCl胁迫中 ,MDA含量明显增加 ,并于胁迫 15小时后达到最大值 ,随后含量增加较小 .进一步分析发现 ,不同浓度NaCl处理对SOD和POD活性以及MDA含量的作用效应是不同的 ,其中 2 6 0mmol·L-1NaCl处理明显促进幼苗SOD和POD活性的下降与MDA含量的增加 ;而且MDA含量与SOD和POD活性的下降有关 .结果表明 ,NaCl胁迫所引起的SOD和POD活性下降可能加强膜脂过氧化作用 ,最终导致幼苗MDA含量的增加与伤害的发生
Under the stress of three different concentrations of NaCl (85mmol·L -1, 1,170mmol·L -1, 1,2 0 0mmol·L -1), the activities of superoxide dismutase (SOD) and peroxidase (POD) ) Activity and the content of malondialdehyde (MDA) were measured.The results showed that the activities of SOD and POD in seedlings decreased significantly after 3 hours of NaCl stress, while the activities of SOD and SOD decreased slowly with the prolongation of stress time The content of MDA was significantly increased in NaCl stress and reached the maximum at 15 hours after stress, and then increased little.After further analysis, it was found that the activity of SOD and POD and the content of MDA The effect was different, among which, the treatment with 260 mmol·L-1 NaCl significantly promoted the decrease of SOD and POD activity and the increase of MDA content, and the content of MDA was related to the decrease of SOD and POD activity.The results showed that NaCl stress caused Decreased activity of SOD and POD may enhance membrane lipid peroxidation, eventually leading to increased MDA content of seedlings and the occurrence of injury