除草剂苯噻草胺胁迫对水稻活性氧清除系统的影响

采用室内培养实验方法,对水稻幼苗的多项生理生化指标进行了测定。结果表明,随着除草剂苯噻草胺浓度的升高,水稻株高变矮,根长缩短;蛋白质、叶绿素和GSH含量应激升高。活性氧·O-2、H2O2和膜脂过氧化产物MDA的含量增加,组织自氧化速率增大,表明苯噻草胺对水稻幼苗的毒害作用主要是破坏了体内的活性氧平衡。水稻叶片中的CAT酶,根中的SOD和POD酶对苯噻草胺的浓度比较敏感。SOD与MDA含量呈显著正相关,提示了抗氧化酶清除活性氧的作用滞后于活性氧对膜脂过氧化的诱导作用。

Effect of Herbicide Mefenacet on Response of Active Oxygen Scavenging System in Rice Plant

Effects of mefenacet on response of active oxygen scavenging system in rice plant were studied. The results showed that mefenacet could cause shorten of height and root length of the plant. Contents of protein, chlorophyll and GSH were increased with the concentration of mefenacet. The contents of active oxygen, lipid oxidation products MDA and autooxidation rate were also enhanced, revealing that balance of active oxygen in the body of rice plant had been disturbed. The activities of antioxidant enzymes were induced by stress of the herbicide. CAT in leaves was sensitive to change of mefenacet, but SOD and POD in roots were more sensitive. SOD showed good relativity with the contents of MDA, which indicated that the process of scavenging active oxygen dropped behind the process of lipid oxidation induction.