【摘要】 通过营养液培养实验 ,研究小麦幼苗在遭受铅胁迫后 ,地上部及根系抗氧化酶活性的变化 .试验表明 :小麦幼苗受到铅胁迫后 ,地上部及根系的超氧化物歧化酶 (SOD)活性均显著增加 ,根系中过氧化氢酶 (CAT)的活性也比对照有所增加 ,但不如SOD酶变化剧烈 ,表明SOD酶活性是比较敏感的生物指标 (biomarker) .但是 ,小麦幼苗地上部及根系的丙二醛 (MDA)含量仍均比对照显著升高 ,表明小麦幼苗的膜系统受到了一定程度的破坏 .试验同时还反映出 ,铅胁迫对小麦幼苗根系的影响远远强于地上部更多还原

【Abstract】 The changes of the antioxidant enzyme activity, such as superoxide dismutase (SOD), catalase (CAT) and malondialdehyde (MDA) were researched through nutrient solution culture. The results showed that the activity of SOD in shoot and root were significantly enhanced under lead stress. The activity of CAT in root was also improved, but the degree was not bigger than that of SOD activity. However, the MDA content in shoot and root was significantly higher than that of check group, it suggested that the membrane system were damaged by lead stress. The experiments also revealed that the shoot of wheat seedling was influenced by lead stress greatly stronger than that of root.更多还原