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通过营养液培养实验,研究了小麦幼苗在遭受汞胁迫后,地上部及根系抗氧化酶活性的变化．试验表明:小麦幼苗受到汞胁迫后,地上部及根系的超氧化物歧化酶(ＳＯＤ)的活性均显著增加,过氧化氢酶(ＣＡＴ) 的活性也比对照有所增强,但不如ＳＯＤ酶变化迅速,表明ＳＯＤ酶活性是小麦幼苗遭受汞胁迫时比较敏感的生物标记物．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,汞胁迫对小麦幼苗根系的影响强于对地上部的影响．
The nutrient solution culture experiments were conducted to study the changes of antioxidant enzyme activity in shoots and roots of wheat seedlings exposed to Hg stress. The results showed that the activities of superoxide dismutase (SOD) in wheat shoots and roots were significantly increased and the activity of catalase (CAT) was also increased, but not as the changes of SOD enzyme Rapidly indicating that SOD activity is a sensitive biomarker for wheat seedlings exposed to mercury stress. However, the content of malondialdehyde (MDA) in shoots and roots of wheat seedlings was still significantly higher than that of the control, indicating that the membrane system of wheat seedlings was damaged to some extent. The experiment also showed that the effect of mercury stress on the root system of wheat seedlings was stronger than that on the shoots.