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首页> 外文期刊>Plant Cell Reports >Calcium protects Trifolium repens L. seedlings against cadmium stress
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Calcium protects Trifolium repens L. seedlings against cadmium stress

机译：钙保护白三叶幼苗免受镉胁迫

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摘要

The effect of calcium (Capo) on Trifolium repens L. seedlings subjected to cadmium (Cdpo) stress was studied by investigating plant growth and changes in activity of antioxidative enzymes. Physiological analysis was carried out on seedlings cultured for 2 weeks on half-strength Hoagland medium with Cdpo concentrations of 0, 400 and 600 oM, and on corresponding medium supplied with CaCl (5 mM). Exposure to increasing Cdpo reduced the fresh weight of the upper part (stems + leaves) of the seedlings more strongly than that of the root system. In both parts of T. repens seedlings HO level and lipid peroxidation increased. In the upper part, Cdpo exposure led to a significant decrease in the activity of superoxide dismutase, catalase and glutathione peroxidase and an increase in ascorbate peroxidase activity. In contrast, the roots showed an increase in the activity of antioxidative enzymes under Cdpo stress. Capo addition to medium reduced the Cdpo accumulation, and considerably reversed the Cdpo-induced decrease in fresh mass as well as the changes in lipid peroxidation in the both parts of T. repens seedlings. Capo application diminished the Cdpo effect on the activity of antioxidative enzymes in the upper part, even though it did not significantly affect these enzymes in the roots. So the possible mechanisms for the action of Capo in Cdpo stress were considered to reduce Cdpo accumulation, alleviate lipid peroxidation and promote activity of antioxidative enzymes.
机译：通过研究植物生长和抗氧化酶活性的变化，研究了钙（Capo）对白三叶幼苗受到镉（Cdpo）胁迫的影响。对在Cdpo浓度分别为0、400和600 oM的半强度Hoagland培养基上以及培养有CaCl（5 mM）的相应培养基上培养2周的幼苗进行生理分析。暴露于增加的Cdpo会比根系更强烈地降低幼苗上部（茎+叶）的新鲜重量。在T. repens的两个部分中，幼苗的HO水平和脂质过氧化作用均增加。在上部，Cdpo暴露导致超氧化物歧化酶，过氧化氢酶和谷胱甘肽过氧化物酶的活性显着降低，而抗坏血酸过氧化物酶的活性增加。相反，根在Cdpo胁迫下显示出抗氧化酶活性的增加。培养基中的变调夹可减少Cdpo的积累，并大大扭转了Cdpo诱导的鲜叶质量下降以及白三叶幼苗两部分脂质过氧化的变化。变调夹的施用减少了Cdpo对上部抗氧化酶活性的影响，即使它并未显着影响根部的这些酶。因此，考虑了Capo在Cdpo胁迫中的作用机制可能是减少Cdpo的积累，减轻脂质过氧化作用并增强抗氧化酶的活性。

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