【摘要】 为探讨钾营养水平在水培水稻对吡虫啉解毒代谢中的作用,在不同钾营养水平[0 mg/L、20 mg/L、40mg/L(对照)、80 mg/L、160 mg/L]下水培水稻,然后喷施不同浓度的吡虫啉(30 mg/L、60 mg/L)药剂,继续培养3 d和6 d后测定水稻叶鞘、根的谷胱甘肽-S-转移酶(GSTs)活性的变化。结果表明:水稻叶鞘、根的GSTs活性变化不同。吡虫啉处理后3 d,水稻叶鞘与根GSTs活性与对照无显著差异。低钾(0 mg/L、20 mg/L)与高钾(80 mg/L、160 mg/L)营养培养的水稻吡虫啉处理后6 d,叶鞘GSTs活性均显著高于对照,低钾与高钾处理间无显著差异;高钾(80 mg/L、160 mg/L)营养培养的水稻吡虫啉处理后6 d,水稻根GSTs活性显著大于低钾培养。更多还原

【Abstract】 To investigate the role of exogenous potassium(K) in rice metabolic detoxification of imidacloprid,glutathione S-transferase(GSTs) activities in shoots and roots of rice were detected after imidacloprid application,in rice hydroponic system with different concentrations of K(0 mg/L,20 mg/L,40 mg/L,80 mg/L,160 mg/L),and 40 mg/L potassium was control.GSTs activities varied in shoots and roots.After 3-d imidacloprid application,GSTs activities in shoots and roots showed no significant differences with control.At 6 d,GSTs activities in shoots were significantly higher than that of control,and GSTs activities in the shoots of rice treated with 80 mg/L and 160 mg/L potassium or 0 mg/L and 20 mg/L potassium were significantly higher than that of control.GSTs activities in the roots of rice with high K treatments were significantly higher than those with low K treatments.Results indicated that low K treatment had more unfavorable effects on roots than on shoots.更多还原