The Cd-induced changes in growth and oxidative metabolism in Ceratophyllum demersum L. Plant were studied. Plants were exposed to various concentrations of CdCl2 (0, 2, 5, 10 μmol/L), biomass and antioxidant enzyme activity were investigated in 1, 2, 4, 8 d after Cd treatment. Results showed that low concentration of Cd promoted the plant growth, while high concentration of Cd inhibited the plant growth. As the treatment time increasing, a Cd2+ concentration of 10 (imol/L will lead to the death of plant, the antioxidant enzyme showed responding to the Cd. Plants showed significant stimulation of the activities of antioxidant enzymes of superoxide dismutase and catalase when the concentration of Cd2+ was lower than 5 μmol/L, at 10 μmol/L exposure, both enzymes' activities declined. In conclusion, increased antioxidant enzyme activity appears to help plants tolerate the toxicity of Cd2* with concentration lower than 5 μmbl/L.
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