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Enhancement of tolerance of Indian mustard (Brassica juncea) to mercury by carbon monoxide

文献类型： 外文期刊

作者： Meng, De Kun 1 ; Chen, Jian 2 ; Yang, Zhi Min 1 ;

作者机构： 1.Nanjing Agr Univ, Dept Biochem & Mol Biol, Coll Life Sci, Nanjing 210095, Peoples R China

2.Jiangsu Acad Agr Sci, Inst Food Safety, Nanjing, Peoples R China

关键词： Carbon monoxide;Mercury;Brassica juncea;Oxidation

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：10.588； 五年影响因子：10.129 ）

ISSN： 0304-3894

年卷期： 2011 年 186 卷 2-3 期

页码：

收录情况： SCI

摘要： Carbon monoxide (CO) is a hazardous gaseous molecule, whose concentration in atmosphere is recently rising. CO also is an endogenous regulator of a variety of biological processes in animals and plants. However, whether CO regulates plant adaptation to Hg-contaminated environments is unknown. In this study, we investigated the effect of CO on biological responses of Indian mustard (Brassica juncea), a plant species frequently used for heavy metal accumulation, to mercury (Hg) toxicity. Exposure of B. juncea to Hg(II) triggered production of O(2)(-) and H(2)O(2) as well as peroxides. However, such an effect can be reversed by CO exposure. Plants treated with 0.2 mM CO accumulated less amounts of Hg and had improved root elongation. Treatment with CO reduced activities of superoxide dismutase and increased activities of catalase, ascorbate peroxidase and guaiacol peroxidase in Hg-treated plants. CO-mediated alleviation of Hg toxicity was closely related to the accumulated proline, an antioxidant and reduced non-protein thiols, a sulfhydryl-containing compound that has strong capability for chelating heavy metals. These results indicate that CO plays a crucial role in preventing the plant from Hg toxicity. (C) 2010 Elsevier B.V. All rights reserved.

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