摘要
研究了重金属污染物镉对４种沉水植物（红线草、金鱼藻、黑藻和菹草）硝酸还原酶和超氧化物歧化酶的分子毒理学效应．实验结果表明，一定浓度的镉能诱导沉水植物的硝酸还原酶活性，抑制沉水植物超氧化物歧化酶活性，从而破坏其抗氧化防御系统．镉对沉水植物的毒害存在明显的剂量／效应关系．建议以硝酸还原酶和超氧化物歧化酶的活性变化作为沉水植物受重金属污染的生态毒理学指标．
Physiological and biochemical effects of cadmium on four species of submerged macrophytes were tested. The results showed that above certain concentration, Cd could induce the activity of nitrate reductase, and inhibit the activity of superoxide dismutase. Thus the antioxidant defense system of these species was injured. There was a positive correlation between dose and effect. Based on the results of this study the activity of superoxide dismutase of submerged macrophytes are expected to be used to monitor and evaluate aquatic ecosystem as a biomarker.
出处
《环境科学学报》
CAS
CSSCI
CSCD
北大核心
1998年第3期313-317,共5页
Acta Scientiae Circumstantiae
基金
"八五"国家科技攻关项目
