Journal
JOURNAL OF PLANT NUTRITION
Volume 28, Issue 11, Pages 1947-1959Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/01904160500310955
Keywords
cadmium; oxidative stress; wheat; zinc
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Two hydroponic experiments were conducted to investigate the antioxidant response of winter wheat (Triticum aestivum L.) to cadmium (Cd)-zinc (Zn) interactions, Seedlings of winter wheat (cv. Yuandong 977), were grown in modified Hoagland nutrient solution with the addition of increasing concentrations of Cd (0, 10, 25, 50 AM). In experiment 2, the seedlings of the same cultivar were treated with constant concentration of Cd (25 mu M) and varying levels of Zn (0, 1, 10, 50 mu M). Hydrogen peroxide (H2O2) and malondialdehyde (MDA) as well as the activities of three antioxidant enzymes, catalase (CAT), guaiacol peroxidase (GPX), ascorbate peroxidase (APX) were monitored to estimate the amount of oxidative stress and the antioxidant ability of seedlings treated with Cd and Zn for 10 days. The results showed that levels of H2O2 and MDA in experiment I were significantly increased with increasing Cd concentrations. The data indicated that Cd could induce oxidative stress and lipid peroxidation in the plants. While H2O2 and MDA levels were significantly reduced by addition of Zn in experiment 2, the activities antioxidant enzymes were enhanced. A concentration of 10 mu M Zn appeared to be the optimal level in this experiment for seedlings' growth, chlorophyll synthesis and antioxidant status, indicating that Zn alleviated the oxidative stress induced by Cd.
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