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THE GROWTH, LEAD ACCUMULATION AND OXIDATIVE STRESS RESPONSE OF Iris lactea var. chinensis UNDER LEAD STRESS

文献类型： 外文期刊

作者： Yuan, Hai-yan 1 ; Huang, Su-zhen 1 ; Han, Yu-lin 2 ; Guo, Zhi 3 ;

作者机构： 1.Jiangsu Prov & Chinese Acad Sci, Nanjing Sun Yat San Bot Garden, Inst Bot, Nanjing 210014, Jiangsu, Peoples R China

2.Jiangxi Univ Finance & Econ, Dept Landscape Architecture, Expt Teaching Ctr Ecol Environm Jiangxi Prov, Art Coll, Nanchang 330032, Peoples R China

3.Jiangsu Acad Agr Sci, Inst Agr Resource & Environm, Nanjing 210014, Peoples R China

关键词： Pb stress;Iris lactea var. chinensis;oxidative stress;antioxidant enzymes;antioxidants

期刊名称：FRESENIUS ENVIRONMENTAL BULLETIN （ 影响因子：0.489； 五年影响因子：0.479 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： The present study aimed at investigating effects of lead (Pb) (30 and 300 mg L~(-1)) stress on growth, Pb accumulation, antioxidative responses of Iris lactea var. chinensis over a 2-month period by hydroponic culture. The results show that the production rate of superoxide radical (O_2) and malondialdehyde (MDA) level in the leaves of I. lactea var. chinensis seedlings under 30 mg L~(-1) Pb stress remained almost unchanged, and hydrogen peroxide (H_2O_2) accumulation decreased as compared to the control whereas the activities of antioxidant enzymes and the contents of antioxidants investigated in shoots and roots increased. At the same time, low Pb concentrations promoted the growth of I. lactea var. chinensis seedlings. These results suggested that I. lactea var. chinensis had a strong oxida-tive ability to moderate Pb stress while high Pb levels (300 mg L~(-1)) provoked oxidative stress and decreased superoxide dismutase (SOD) and peroxidase (POD) activities, especially those in the roots. In addition, high bioac-cumulation of Pb was accompanied by an obvious decrease in dry weight. However, catalase (CAT) activities and glutathione (GSH) contents in shoots and roots exposed to 300 mg L~(-1) Pb were higher than the control. Therefore, CAT and GSH might play a major defense role in Pb detoxification when exposed to high Pb stress.

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