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Effects of exogenous salicylic acid on manganese toxicity, element contents and antioxidative system in cucumber

机译：外源水杨酸对黄瓜锰毒性，元素含量和抗氧化系统的影响

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The effects of salicylic acid (SA) on manganese (Mn) toxicity in cucumber plants (Cucumis sativus L.) were studied by investigating the symptoms, plant growth, lipid peroxidation, antioxidative enzymes and antioxidants. Excess Mn caused serious chlorosis and inhibited the growth of cucumber plants, and dramatically increased accumulation of Mn in both shoots and roots, furthermore, inhibited the absorption of Ca, Mg and Zn. Addition of SA decreased the transport of Mn from roots to shoots, alleviated the inhibition of Ca, Mg and Zn absorption induced by excess Mn, reduced the toxicity symptoms and promoted the plant growth. The accumulation of reactive oxygen species (ROS) significantly increased in cucumber leaves exposed to excess Mn, and resulted in the lipid peroxidation, which was indicated by accumulated concentration of thiobarbituric acid-reactive substances (TBARS). Addition of SA significantly decreased the level of ROS and lipid peroxidation. Activities of antioxidant enzymes showed different changes, addition of SA inhibited catalase (CAT) and ascorbate peroxidase (APX) activities, while increased activities of superoxide dismutase (SOD), peroxidase (POD), dehydroascorbate reductase (DHAR) and glutathione reductase (GR) in cucumber leaves exposed to excess Mn. As important antioxidants, ascorbate and glutathione contents in cucumber leaves exposed to excess Mn were significantly increased by SA treatment. (C) 2007 Elsevier B.V. All rights reserved.
机译：通过调查症状，植物生长，脂质过氧化，抗氧化酶和抗氧化剂，研究了水杨酸（SA）对黄瓜植物（Cucumis sativus L.）中锰（Mn）毒性的影响。过量的锰引起严重的绿化，抑制黄瓜植株的生长，并显着增加茎和根中锰的积累，进而抑制钙，镁和锌的吸收。添加SA减少了Mn从根到芽的转运，减轻了过量Mn诱导的Ca，Mg和Zn吸收的抑制，减轻了毒性症状并促进了植物的生长。暴露于过量Mn的黄瓜叶片中活性氧（ROS）的积累显着增加，并导致脂质过氧化，这通过硫代巴比妥酸反应性物质（TBARS）的累积浓度来表明。添加SA可以显着降低ROS和脂质过氧化的水平。抗氧化酶的活性表现出不同的变化，添加SA抑制过氧化氢酶（CAT）和抗坏血酸过氧化物酶（APX）的活性，而增加过氧化物歧化酶（SOD），过氧化物酶（POD），脱氢抗坏血酸还原酶（DHAR）和谷胱甘肽还原酶（GR）在黄瓜叶片中暴露于过量的锰。作为重要的抗氧化剂，暴露于过量锰的黄瓜叶片中抗坏血酸和谷胱甘肽的含量通过SA处理显着增加。 （C）2007 Elsevier B.V.保留所有权利。

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