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The phytotoxic effects of selenium-mercury interactions on root growth in Brassica rapa (LvLing)

文献类型： 外文期刊

作者： Bian, Zhi-Wei 1 ; Chen, Jian 2 ; Li, Hui 1 ; Liu, Dan-Dan 1 ; Yang, Li-Fei 1 ; Zhu, Yue-Lin 1 ; Zhu, Wen-Li 1 ; Liu, Wei; 1 ;

作者机构： 1.Nanjing Agr Univ, Coll Hort, Nanjing 210095, Jiangsu, Peoples R China

2.Jiangsu Acad Agr Sci, Inst Food Qual & Safety, Nanjing 210014, Jiangsu, Peoples R China

关键词： antioxidant enzyme;cell death;non-heading Chinese cabbage;oxidative injury;selenium-mercury treatment;toxic effect

期刊名称：HORTICULTURE ENVIRONMENT AND BIOTECHNOLOGY （ 影响因子：1.842； 五年影响因子：2.083 ）

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收录情况： SCI

摘要： Rapid industrial and agricultural development has dramatically increased the emission of selenium (Se) and mercury (Hg) into the environment. Combined soil pollution by Se and Hg poses a potential threat to crop production. However, no toxic effects of Hg-Se interactions on plants have been reported previously. In this study, we investigated the effects of Hg-Se interactions on biochemical and physiological indices in the roots of Brassica rapa (LvLing). Seedlings were treated hydroponically with solutions of mercury chloride (1 mu M), sodium selenite (4 mu M), or a combination of the two. Combined Hg+Se treatment significantly inhibited root growth, reduced root biomass, and enhanced reactive oxygen species (ROS) and malondialdehyde accumulation and led to a loss of plasma membrane integrity. The combined treatment increased glutathione peroxidase, glutathione S-transferase, and peroxidase activity, reduced superoxide dismutase activity, and had no effect on catalase activity. In addition, we detected increased glutathione concentrations in root tips and reduced ascorbic acid concentrations in the presence of Hg+Se relative to individual treatments with these elements. Thus, Hg-Se interactions enhanced oxidative injury, cell death, and phytotoxicity in B. rapa roots.

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