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首页> 美国卫生研究院文献>Plant Physiology >Influence of salicylic acid on H2O2 production oxidative stress and H2O2-metabolizing enzymes. Salicylic acid-mediated oxidative damage requires H2O2.
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Influence of salicylic acid on H2O2 production oxidative stress and H2O2-metabolizing enzymes. Salicylic acid-mediated oxidative damage requires H2O2.

机译：水杨酸对H2O2产生氧化应激和H2O2代谢酶的影响。水杨酸介导的氧化损伤需要H2O2。

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摘要

We investigated how salicylic acid (SA) enhances H2O2 and the relative significance of SA-enhanced H2O2 in Arabidopsis thaliana. SA treatments enhanced H2O2 production, lipid peroxidation, and oxidative damage to proteins, and resulted in the formation of chlorophyll and carotene isomers. SA-enhanced H2O2 levels were related to increased activities of Cu,Zn-superoxide dismutase and were independent of changes in catalase and ascorbate peroxidase activities. Prolonging SA treatments inactivated catalase and ascorbate peroxidase and resulted in phytotoxic symptoms, suggesting that inactivation of H2O2-degrading enzymes serves as an indicator of hypersensitive cell death. Treatment of leaves with H2O2 alone failed to invoke SA-mediated events. Although leaves treated with H2O2 accumulated in vivo H2O2 by 2-fold compared with leaves treated with SA, the damage to membranes and proteins was significantly less, indicating that SA can cause greater damage than H2O2. However, pretreatment of leaves with dimethylthiourea, a trap for H2O2, reduced SA-induced lipid peroxidation, indicating that SA requires H2O2 to initiate oxidative damage. The relative significance of the interaction among SA, H2O2, and H2O2-metabolizing enzymes with oxidative damage and cell death is discussed.
机译：我们调查了水杨酸（SA）如何增强H2O2以及SA增强的H2O2在拟南芥中的相对重要性。 SA处理提高了H2O2的产生，脂质的过氧化作用以及对蛋白质的氧化损伤，并导致了叶绿素和胡萝卜素异构体的形成。 SA增强的H2O2水平与铜，锌超氧化物歧化酶活性的增加有关，并且与过氧化氢酶和抗坏血酸过氧化物酶活性的变化无关。延长SA治疗会使过氧化氢酶和抗坏血酸过氧化物酶失活，并导致植物毒性症状，这表明H2O2降解酶的失活可作为超敏细胞死亡的指标。仅用H2O2处理叶片就无法引起SA介导的事件。尽管用H2O2处理的叶片与用SA处理的叶片相比在体内积累了2倍的H2O2，但对膜和蛋白质的破坏明显较少，这表明SA比H2O2造成的破坏更大。但是，用二甲硫脲（H2O2的捕集阱）预处理叶片可减少SA诱导的脂质过氧化，这表明SA需要H2O2来引发氧化损伤。讨论了SA，H2O2和H2O2代谢酶与氧化损伤和细胞死亡之间相互作用的相对重要性。

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