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首页> 外文期刊>Acta Physiologiae Plantarum >Trivalent chromium pretreatment alleviates the toxicity of oxidative damage in wheat plants exposed to hexavalent chromium
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Trivalent chromium pretreatment alleviates the toxicity of oxidative damage in wheat plants exposed to hexavalent chromium

机译：三价铬预处理可减轻暴露于六价铬的小麦植物氧化损伤的毒性

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摘要

Treating plants with abiotic or biotic factors can lead to the establishment of a unique primed state of defense. Primed plants display enhanced defense reactions upon further challenge with environmental stressors. Here, we report that trivalent chromium (Cr(III)) pretreatment can alleviate hexavalent chromium (Cr(VI)) toxicity in 2-week-old wheat plants. The data indicate that Cr(III)-pretreated wheat displayed longer survival times and less heavy metal toxicity symptoms under Cr(VI) exposure thanthe control. To investigate the possible mechanism from an antioxidant defense perspective, we determined the H2O2 and lipid peroxide content (TBARS), the activities of antioxidant enzymes (SOD, CAT, APX and GR) and the antioxidant metabolite content (ascorbate and glutathione content, AsA/DHA and GSH/GSSG ratios) in pretreated wheat roots. The results showed that 0.5 μM Cr(III) pretreatment can alleviate oxidative damage, such as H2O2 and TBARS accumulation, in root tissues compared to the control during the first 3 days of Cr(VI) exposure. Furthermore, we determined that this pretreatment can significantly increase the antioxidant enzyme activities and total ascorbate and glutathione contents compared to the control treatment. In addition, redox homeostasis declined slightly in pretreated wheat compared to the control in the presence of Cr(VI). We discuss a possible mechanism for Cr(III)-mediated protection of wheat.
机译：用非生物或生物因子处理植物可以导致建立独特的防御状态。受到环境胁迫的进一步挑战后，发芽的植物显示出增强的防御反应。在这里，我们报告三价铬（Cr（III））预处理可以减轻2周龄小麦植株中的六价铬（Cr（VI））毒性。数据表明，与对照相比，Cr（III）预处理的小麦在Cr（VI）暴露下显示出更长的生存时间和更少的重金属毒性症状。为了从抗氧化剂防御的角度研究可能的机制，我们确定了H2O2和脂质过氧化物含量（TBARS），抗氧化剂酶的活性（SOD，CAT，APX和GR）以及抗氧化剂代谢产物的含量（抗坏血酸和谷胱甘肽含量，AsA /预处理的小麦根中的DHA和GSH / GSSG比率）。结果表明，在暴露的前三天，与对照相比，0.5μMCr（III）预处理可以减轻根组织中的氧化损伤，例如H2O2和TBARS积累。此外，我们确定与对照治疗相比，该预处理可以显着增加抗氧化酶活性以及总抗坏血酸和谷胱甘肽含量。此外，与存在Cr（VI）的对照相比，预处理小麦的氧化还原稳态也略有下降。我们讨论了Cr（III）介导的小麦保护的可能机制。

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