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首页> 外文期刊>Plant Growth Regulation >Organic Acids Accumulation and Antioxidant Enzyme Activities in Thlaspi caerulescens under Zn and Cd Stress
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Organic Acids Accumulation and Antioxidant Enzyme Activities in Thlaspi caerulescens under Zn and Cd Stress

机译：锌和镉胁迫下拟南芥中有机酸的积累和抗氧化酶活性

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摘要

Growth, organic acid and phytochelatin accumulation, as well as the activity of several antioxidative enzymes, i.e. superoxide dismutase (SOD), ascorbate peroxidase (APX) guaiacol peroxidase (POX) and catalase (CAT) were investigated under Zn and Cd stress in hydroponically growing plants of Thlaspi caerulescens population from Plombières, Belgium. Tissue Zn and Cd concentration increased (the highest concentration of both was in roots) as the concentration of these metals increased in the nutrient solution. Increasing Zn concentration enhanced plant growth, while with Cd it declined compared to the control. Both metals stimulated malate accumulation in shoots, Zn also caused citrate to increase. Zn did not induce phytochelatin (PC) accumulation. In plants exposed to Cd, PC concentration increased with increasing Cd concentration, but decreased with time of exposure. Under Zn stress SOD activity increased, but APX activity was higher at 500 and 1000 μM Zn and CAT activity only at 500 μM Zn in comparison with the control. CAT activity decreased in Cd- and Zn-stressed plants. The results suggest that relative to other populations, a T. caerulescens population from Plombières, when grown in hydroponics, was characterized by low Zn and Cd uptake and their translocation to shoots and tolerance to both metals. The accumulation of malate and citrate, but not PC accumulation was responsible for Zn tolerance. Cd tolerance seems to be due to neither PC production nor accumulation of organic acids.
机译：在水培条件下，研究了锌和镉胁迫下的生长，有机酸和植物螯合素的积累以及几种抗氧化酶的活性，即超氧化物歧化酶（SOD），抗坏血酸过氧化物酶（APX）愈创木酚过氧化物酶（POX）和过氧化氢酶（CAT）。来自比利时Plombières的Thlaspi caerulescens种群的植物。随着营养液中这些金属的浓度增加，组织中的Zn和Cd浓度增加（两者的最高浓度在根中）。锌浓度的增加促进了植物的生长，而镉含量与对照相比下降了。两种金属都刺激苹果酸在芽中的积累，锌也引起柠檬酸盐的增加。锌没有诱导植物螯合素（PC）的积累。在暴露于Cd的植物中，PC浓度随Cd浓度的增加而增加，但随着暴露时间的延长而降低。与对照相比，在锌胁迫下，SOD活性增加，但APX活性在500和1000μMZn时更高，而CAT活性仅在500μMZn时更高。镉和锌胁迫植物的CAT活性下降。结果表明，相对于其他种群，Plombières的拟南芥种群在水培法中生长时，其锌和镉吸收量低，易位到苗和对这两种金属具有耐受性。苹果酸和柠檬酸盐的积累，而不是PC积累，是造成锌耐受性的原因。镉耐受性似乎既不是由于PC生产也不是有机酸的积累。

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