中华稻蝗不同体段镉与铅含量及抗氧化酶的比较

采用现场采样及室内测试方法,对中华稻蝗不同体段的镉与铅含量、MDA及H2O2自由基含量、GSH含量及其相关酶（GST、GPx、GR）活性、SOD及CAT活性进行了研究。结果表明,镉与铅含量均在胸部最高,其次为腹部和头部,后足含量最低。胸部镉含量分别是腹部、头部和后足的2.83、3.40和5.67倍,铅含量分别是腹部、头部和后足的1.29、1.39和1.41倍。GSH、MDA、H2O2含量及SOD、CAT活性均为后足最高,其次为头部和腹部,胸部最低。GST在4个体段的活性无显著差异。GR活性的顺序为头部〉胸部〉腹部〉后足,GPx活性的顺序为头部〉腹部〉胸部〉后足。进入土壤中的镉与铅经食物链转运后,在中华稻蝗体内富集,据此可将中华稻蝗作为农业环境中镉与铅污染的指示生物。

Comparisons of Cadmium and Lead Concentrations and Antioxidant Enzyme Activities in Different Body Segments of Oxya chinensis

Cadmium （Cd）, lead（Pb ）, MDA, H2O2, GSH concentrations and GST, GR, GPx, SOD, CAT activities in different body segments of Oxya chinensis were analyzed. It showed that Cd and Pb concentrations were the highest in the thorax, followed by abdomen and head, while the lowest concentrations were found in the femur. The Cd and Pb concentrations in thorax were 2.83, 3.40 and 5.67 folds and 1.29, 1.39 and 1.41 folds higher than those in abdomen, head and femur, respectively. GSH, MDA, and H2O2 concentrations and SOD, CAT activities were the highest in the femur, followed by head and abdomen. The lowest concentrations and activities were found in the thorax. GST activities in the four body segments showed no significant differences. The rank order of GR activities were head〉thorax〉abdomen〉femur, whereas the rank order of GPx activities were head〉abdomen〉thorax〉femur. The Cd and Pb concentrations in Oxya chinensis were biomagnified through the food chain of soil-rice-grasshopper. This suggests that, Oxya chinensis may be useful as the bioindicator of Cd and Pb pollution in agricultural environment.