Oxidative stress in duckweed (Lemna minor L.) caused by short-term cadmium exposure

被引：89

作者：

Razinger, Jaka ^{[1
]}

Dermastia, Marina ^{[2
,3
]}

Koce, Jasna Dolenc ^{[3
]}

Zrimec, Alexis ^{[1
]}

机构：

[1] Inst Phys Biol, Dept Environm Technol & Biomonitoring, SI-1290 Grosuplje, Slovenia

[2] Natl Inst Biol, SI-1001 Ljubljana, Slovenia

[3] Univ Ljubljana, Biotech Fac, Dept Biol, SI-1000 Ljubljana, Slovenia

来源：

ENVIRONMENTAL POLLUTION | 2008年 / 153卷 / 03期

关键词：

antioxidant enzymes; biomarkers; cadmium; glutathione; lipid peroxidation; oxidative stress; total antioxidative potential;

D O I：

10.1016/j.envpol.2007.08.018

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The mechanisms of plant defence against cadmium toxicity have been studied by short-term exposure of Lemna minor L. (common duckweed) to concentrations of CdCl2 ranging from 0 to 500 mu M. High accumulation of cadmium was observed (12,320 +/- 2155 mu g g(-1) at 500 mu M CdCl2), which caused a gradual decrease of plant growth, increased lipid peroxidation, and weakened the entire antioxidative defence. Total glutathione concentration decreased significantly; however, the concentration of oxidized glutathione remained stable. The responses of four antioxidant enzymes showed that catalase was the most inhibited after CdCl2 exposure, ascorbate peroxidase and guaiacol peroxidase moderately, and glutathione reductase least. The total antioxidative potential revealed an induced antioxidative network at 0.1 mu M CdCl2 (137 +/- 13.2% of the control) and its reduction to only 47.4 +/- 4.0% of the control at higher cadmium concentrations. The possible application of the examined biomarkers in ecotoxicological research is discussed. (C) 2007 Elsevier Ltd. All rights reserved.

引用

页码：687 / 694

页数：8

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