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首页> 外文期刊>Chinese science bulletin >Synergistic defensive mechanism of phytochelatins and antioxidative enzymes in Brassica chinensis L. against Cd stress
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Synergistic defensive mechanism of phytochelatins and antioxidative enzymes in Brassica chinensis L. against Cd stress

机译：小白菜中植物螯合物和抗氧化酶的协同防御机制

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Brassica chinensis L. was chosen and exposed to different concentrations of Cd exposure to evaluate its Cd-accumulating capacity and its potential cellular defensive mechanisms. Cd accumulation in the shoots and roots of B. chinensis was up to 1348.3 +/- 461.8 and 3761.0 +/- 795.0 mg per killogram of dry weight, respectively, under 200 mu mol/L of Cd exposure. Increasing Cd accumulation in the plant was accompanied by rapid accumulation of phytochelatins (PCs), and the sequestration of Cd by PCs provided a primary cellular mechanism for Cd detoxification and tolerance of B. chinensis. Furthermore, malondialdehyde formation, hydrogen peroxide content and antioxidative enzyme activities such as superoxide dismutase, catalase, guaiacol peroxidase and ascorbate peroxidase were observed in the shoots of Cd-stressed B. chinensis. Increasing enzyme activities in response to concentrations of 5 to 50 mu mol/L Cd showed an efficient defense against oxidative stress, suggesting that the antioxidative system was a secondary defensive mechanism. These resulted in reduced free Cd damage and enhanced Cd accumulation and tolerance. Glutathione plays a pivotal role in these two detoxification pathways. In general, these results suggested that PCs and the antioxidative system are synergistic in combatting Cd-induced oxidative stress and that they play important roles in Cd detoxification of B. chinensis, and also give a deep understanding of the natural defensive mechanisms in plants under heavy metal stress.
机译：选择甘蓝型油菜并暴露于不同浓度的镉下以评估其镉积累能力和潜在的细胞防御机制。在200μmol / L的Cd暴露下，干白菜的茎和根中的Cd积累分别高达每干重图的1348.3 +/- 461.8和3761.0 +/- 795.0 mg。植物体内Cd积累的增加伴随着植物螯合素（PCs）的快速积累，而PC螯合Cd为C.解毒和中华白僵菌的耐受提供了主要的细胞机制。此外，在镉胁迫下的中华芽枝中还发现了丙二醛的形成，过氧化氢的含量和抗氧化酶的活性，如超氧化物歧化酶，过氧化氢酶，愈创木酚过氧化物酶和抗坏血酸过氧化物酶。浓度为5至50μmol / L的Cd时，酶活性的增加显示出对氧化应激的有效防御作用，表明抗氧化系统是次要防御机制。这些导致减少的游离Cd损害和增强的Cd积累和耐受性。谷胱甘肽在这两个排毒途径中起着关键作用。总的来说，这些结果表明，PCs和抗氧化系统在对抗Cd引起的氧化应激方面具有协同作用，并且它们在中华白僵菌的Cd解毒中起着重要作用，也使人们对重度植物的自然防御机制有了深入的了解。金属应力。

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