EFFECTS OF CADMIUM ON NITRATE REDUCTASE AND SPEROXIDE DISMUTASE OF SUBMERGED MACROPHYTES
镉对沉水植物硝酸还原酶和超氧化物歧化酶活性的影响

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.