CdCl2和HgCl2对沙鼠酶抗氧化系统激活的影响

A. Hameed, T. N. Qadri, Mahmooduzzafar, T. O. Siddiqi, M. Iqbal
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引用次数: 20

摘要

镉和汞诱导沙鼠对各种酶(抗坏血酸过氧化物酶(APX, 1.11.1.11)、过氧化氢酶(CAT, 1.11.1.6)、谷胱甘肽还原酶(GR, 1.6.4.2)和超氧化物歧化酶(SOD, 1.15.1.1)产生不同的反应,这些酶与施加的汞和镉水平以及处理后已经存在或诱导的硫基浓度关系最为密切。在本研究中,不同浓度的CdCl2和HgCl2(分别为0、0.05、0.10、0.50、1和2mM)施用于植物土壤中,抗坏血酸过氧化物酶、谷胱甘肽还原酶和超氧化物歧化酶活性显著增加,金属积累量显著增加。它揭示了一种持续解毒H2O2的机制,这种机制与这种植物在逆境条件下的适应和最终生存有关。过氧化氢酶活性的降低被观察到暴露于这些金属,这可能是由于酶合成的抑制。在0.05 mM CdCl2处理下,根长、茎长、叶数均呈增强趋势,但随着浓度的增加,根长、茎长、叶数逐渐下降。结果表明,金盏花对这些高浓度的金属具有耐受性,这一特性与其酶抗氧化系统的差异激活有关,同时也表明金盏花具有更高的Cd吸收能力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Differential activation of the enzymatic antioxidant system of Abelmoschus esculentus L. under CdCl2 and HgCl2 exposure
Cadmium and Mercury induced varying responses in Abelmoschus esculentus L. in relation to enzymes (ascorbate peroxidase (APX, 1.11.1.11), catalase (CAT, 1.11.1.6), glutathione reductase (GR, 1.6.4.2) and superoxide dismutase (SOD, 1.15.1.1) which are most related to the levels of Hg and Cd applied and concentrations of thiol groups already present or induced upon treatment. In the present investigation varying concentrations of CdCl2 and HgCl2 (0, 0.05, 0.10, 0.50, 1 and 2mM respectively) applied to plant in the soil shows a significant increase in ascorbate peroxidase, glutathione reductase and superoxide dismutase activities, and the respective metal accumulation. It reveals a mechanism for constant detoxification of H2O2 that have to be associated with adaptations and ultimate survival of this plant species during stress conditions. A reduction of catalase activities was observed on exposure to these metals, which is supposedly due to the inhibition of enzyme synthesis. Root length, shoot length, number of leaves showed an enhancement with 0.05 mM CdCl2 dose then a gradual decline with the increase in concentrations. The results indicate that A. esculentus is tolerant to high concentrations of these metals, a property related to a differential activation of its enzymatic antioxidant system, and also reveal that this species has a higher capacity of Cd absorption.
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