| 镉对沉水植物硝酸还原酶和超氧化物歧化酶活性的影响 |
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| 引用本文： | 陈愚,任久长,蔡晓明. 镉对沉水植物硝酸还原酶和超氧化物歧化酶活性的影响[J]. 环境科学学报, 1998, 18(3): 313-217 |
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| 作者姓名： | 陈愚 任久长 蔡晓明 |
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| 作者单位： | 1. 北京大学生命科学学院,北京,100871
2. 北京大学环境科学中心环境模拟与污染控制国家重点实验室,北京,100871 |
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| 基金项目： | “八五”国家科技攻关项目 |
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| 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。
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| 关 键 词： | 沉水植物 镉 生物指标 重金属污染 毒理学 |
| 收稿时间： | 1996-07-25 |
| 修稿时间： | 1997-04-23 |
EFFECTS OF CADMIUM ON NITRATE REDUCTASE AND SPEROXIDE DISMUTASE OF SUBMERGED MACROPHYTES |
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| Chen Yu,Ren Jiuchang and Cai Xiaoming. EFFECTS OF CADMIUM ON NITRATE REDUCTASE AND SPEROXIDE DISMUTASE OF SUBMERGED MACROPHYTES[J]. Acta Scientiae Circumstantiae, 1998, 18(3): 313-217 |
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| Authors: | Chen Yu Ren Jiuchang Cai Xiaoming |
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| Affiliation: | College of Life Science, Peking University, Beijing 100871,State Key Laboratory of Environmental Simulation and Pollution Control, Centre of Environmental Science, Peking University, Beijing 100871 and State Key Laboratory of Environmental Simulation and Pollution Control, Centre of Environmental Science, Peking University, Beijing 100871 |
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| Abstract: | 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. |
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| Keywords: | submerged macrophyte cadmium biological criteria. |
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