主要从DNA一级结构及抗氧化酶系变化两方面，研究了Hg2+胁迫下浮萍体细胞的损伤。结果表明：运用随机扩增多态性DNA法（Random amplified polymorphism DNA， RAPD）和DNA梯法（DNA Ladder），5～10 mg·L-1 Hg2+处理组可检测到基因组DNA的明显损伤，20 mg·-1 Hg2+已导致细胞坏死；RAPD法较DNA Ladder法更灵敏。本文还发现，活性氧和抗氧化酶系很可能参与了浮萍体细胞凋亡过程。低浓度的Hg2+胁迫可刺激抗氧化酶活性升高，以清除体内活性氧，而一旦活性氧水平超出一定域值，抗氧化酶活性急速下降，导致细胞凋亡。
The damage toLemna minor cells induced by Hg2+ was studied in this article. Most damage occurred to DNA primary structure and changes in antioxidant enzyme activities were investigated by using RAPD and DNA ladder methods. The results showed that obvious damage to DNA was found in the process of apoptosis induced by 5-10 mg·L-1 Hg2+, and 20 mg·L-1 Hg2+ had already caused necrotic injury. The RAPD method was the more sensitive of the two methods, and so could be considered as an important method for monitoring apoptosis. The results also indicated that reactive oxygen species (ROS) and antioxidant enzymes are involved in the process of apoptosis. The activities of antioxidant enzymes could be stimulated to eliminate active oxygen by exposing the Lemna minor to low Hg2+ concentration; the cells declined rapidly when ROS were unable to be eliminated effectively.