Relationship Between Proline and Hg2+-Induced Oxidative Stress in a Tolerant Rice Mutant

文献类型： 外文期刊

第一作者： Wang, Feijuan

作者： Wang, Feijuan;Zeng, Bin;Zhu, Cheng;Sun, Zongxiu

作者机构：

期刊名称：ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY （ 影响因子：2.804； 五年影响因子：3.399 ）

ISSN： 0090-4341

年卷期： 2009 年 56 卷 4 期

页码：

收录情况： SCI

摘要： There has been little agreement regarding the mechanism by which proline reduces heavy metal stress. The present work examines the relationship between Hg2+-induced oxidative stress and proline accumulation in rice and explores the possible mechanisms through which proline protects against Hg2+ stress. The effect of proline on alleviation of Hg2+ toxicity was studied by spectrophotography and enzymatic methods. Hg2+ induced oxidative stress in rice by increasing lipid peroxidation. Pretreatment of the rice with 2 mM proline for 12 h profoundly alleviated Hg2+-induced lipid peroxidation and minimized H2O2 accumulation. Proline pretreatment significantly reduced (p < 0.01) the Hg2+ content in rice leaves. A comparison of the effects of proline pretreatment on H2O2 accumulation by Hg2+ and aminotrazole suggested that proline protected cells from Hg2+-induced oxidative stress by scavenging reactive oxygen species. The present work demonstrates a protective effect of proline on Hg2+ toxicity through detoxifying reactive oxygen species, rather than chelating metal ions or maintaining the water balance under Hg2+ stress.

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