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首页> 外文期刊>Physiology and Molecular Biology of Plants >Mercury induced phytotoxicity and oxidative stress in wheat (Triticum aestivum L.) plants
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Mercury induced phytotoxicity and oxidative stress in wheat (Triticum aestivum L.) plants

机译：汞诱导小麦（Triticum aestivum L.）植物的植物毒性和氧化胁迫

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The phytotoxicity and oxidative damage in response to different concentrations of Hg (0.0, 2.5, 5.0, 10 and 25 μM) were evaluated in wheat plants. The root and shoot growth, content of chlorophyll and total soluble protein declined at 10 and 25 μM Hg. Roots of the plant were more affected as compared to the shoot. The malondialdehyde (MDA) quantity enhanced in the roots of wheat plants treated with 10 and 25 μM Hg and in the leaves of plants treated with 25 μM Hg. The concentration of H2O2 decreased at low concentration and increased at high concentration of Hg. The induction of enzymatic antioxidants (catalase, CAT; ascorbate peroxidase, APX; peroxidase, POX and superoxide dismutase, SOD) was found in the roots and leaves of plants with increased concentration of Hg up to 10 μM and low activities of these enzymes were observed at 25 μM Hg. Also, the level of K, Ca and Mg declined in leaf tissues of Hg treated plants. Thus wheat plants exposed to lower concentrations of Hg did not experience any oxidative stress. However, on treatment with 10 μM Hg, the roots and leaves responded differently. Both the leaves and roots of plants treated with higher concentration of Hg were subjected to comparatively greater oxidative damage and demonstrated that the antioxidative components were not able to remove the stress due to higher concentration of Hg and thus might affect the productivity in wheat plants.
机译：在小麦植株中评估了对不同浓度的汞（0.0、2.5、5.0、10和25μM）的响应所产生的植物毒性和氧化损伤。根茎生长，叶绿素含量和总可溶性蛋白在10和25μMHg时下降。与芽相比，植物的根受到的影响更大。用10和25μMHg处理的小麦植物的根部和用25μMHg处理的植物的叶片中的丙二醛（MDA）含量增加。 H 2 O 2 的浓度在低浓度时降低，而在高浓度时升高。在植物的根和叶中发现了酶抗氧化剂（过氧化氢酶，CAT；抗坏血酸过氧化物酶，APX；过氧化物酶，POX和超氧化物歧化酶，SOD）的诱导，Hg的浓度增加到10μM，并且这些酶的活性低。在25μMHg下同样，经汞处理的植物的叶片组织中的钾，钙和镁含量下降。因此，暴露于较低汞含量的小麦植株没有任何氧化胁迫。但是，用10μMHg处理时，根和叶的反应不同。汞浓度较高的植物叶片和根部均受到相对较大的氧化损伤，表明汞含量较高时，抗氧化成分不能消除胁迫，因此可能影响小麦植株的生产力。

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