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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >A time course assessment of changes in reactive oxygen species generation and antioxidant defense in hydroponically grown wheat in response to lead ions (Pb ~(2+))
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A time course assessment of changes in reactive oxygen species generation and antioxidant defense in hydroponically grown wheat in response to lead ions (Pb ~(2+))

机译：响应铅离子（Pb〜（2+））的水培小麦中活性氧的产生和抗氧化防御变化的时程评估

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摘要

We examined the effect of Pb ~(2+) (8 and 40 mg l ~(-1)) on reactive oxygen species generation and alterations in antioxidant enzymes in hydroponically grown wheat at 24, 72, and 120 h after exposure. Pb ~(2+) toxicity was more pronounced on root growth, and it correlated with the greater Pb accumulation in roots. Pb exposure (40 mg l ~(-1)) enhanced superoxide anion, H _2O _2, and MDA content in wheat roots by 1. 9- to 2. 2-folds, 56-255%, and 41-90%, respectively, over the control. Pb-induced loss of membrane integrity was confirmed by the enhanced electrolyte leakage and in vivo histochemical localization. Activities of scavenging enzymes, superoxide dismutases and catalases, enhanced in Pb-treated wheat roots by 1. 4- to 5. 7-folds over that in the control. In contrast, the activities of ascorbate and guaiacol peroxidases and glutathione reductases decreased significantly, suggesting their non-involvement in detoxification process. The study concludes that Pb 2+-induced oxidative damage in wheat roots involve greater H _2O _2 accumulation and the deactivation of the related scavenging enzymes.
机译：我们研究了暴露后24、72和120 h，Pb〜（2+）（8和40 mg l〜（-1））对水培小麦中活性氧的产生和抗氧化酶变化的影响。 Pb〜（2+）毒性在根系生长上更为明显，并且与根系中更大的Pb积累相关。铅暴露（40 mg l〜（-1））可使小麦根中的超氧阴离子，H _2O _2和MDA含量分别增加1. 9至2. 2倍，56-255％和41-90％。 ，可以控制。铅诱导的膜完整性的丧失被增强的电解质渗漏和体内组织化学定位所证实。铅处理过的小麦根中清除酶，超氧化物歧化酶和过氧化氢酶的活性比对照提高了1. 4至5. 7倍。相反，抗坏血酸和愈创木酚过氧化物酶和谷胱甘肽还原酶的活性显着降低，表明它们不参与排毒过程。研究得出的结论是，Pb 2+诱导的小麦根系氧化损伤涉及更大的H _2O _2积累和相关清除酶的失活。

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