Abstract
A hoagland solution hydroponic experiment was carried out to study the short-duration (8 d) accumulation ability of uranium byEichhornia crassipesandPistia stratiotesunder different uranium concentration. Effects on antioxidant enzymes (SOD, CAT, POD) activity, malondialdehyde (MDA) and free proline content ofE.crassipesandP.stratiotesunder uranium stress were discussed. The results show the activity of antioxidant enzymes is increased under 0.1~1 mg·L-1uranium stress, MDA content is at lower level indicated that antioxidant enzymes play an important role in alleviating lipid peroxidation induced by uranium stress. Under 5mg·L-1uranium stress, the antioxidant enzymes activity ofE.crassipesis at higher level and MDA content is lower,nevertheless, theP.stratiotesis just the opposite, indicating thatE.crassipestolerated higher concentrations thanP.stratiotes. The activity of antioxidant enzymes is inhibited under higher concentration (20 mg·L-1and 50 mg·L-1) uranium stress. As an important osmoregulation material, free proline content of both plants is more than the contrast.
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