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《China Environmental Science》 1998-01
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Effects of cadmium stress on lipid peroxidation in wheat leaves.

Luo Lixin,Sun Tieheng,Jin Yuehua(Institute of Applied Ecology, Chinese Academy of Sciences,Shenyang 110015).  
Lipid peroxidation is one of the most deteriorative reactions damaging cellular membrane.For further understanding the lipid peroxidation in wheat leaves under cadmium stress, hydrogen peroxide scavenging system was studied. Germi nating seedlings of wheat ( Tritium aestivum) were treated with different concentrations of cadmium acetate (0.05, 0.1,0.3, 0.5 and 1.0 mmol/L). Cadmium stress significantly enhanced the accumulation of H 2O 2 in cells. Activities of ascorbate peroxidase (EC 1.11.1.7) and glutathione reductase (EC 1.6.4.2) decreased apparently , and contents of ascorbic acid and glutathione also dropped under Cd stress. Furthermore, the rate of tissue autoxidation in leaves was higher than that of the control, which indicated lipid peroxidation of cellular membrane was stimulated by endogenous active oxygen radicals. The results suggest that effects of cadmium on wheat leaves is achieved by excessive accumulation of active oxygen radicals resulted from the degradation of the radical scavenging system.
【Fund】: 博士后科学基金
【CateGory Index】: X503.231
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