Zinc induced phytotoxicity mechanism involved in root growth of Triticum aestivum L.

被引：35

作者：

Li, Xiaoning ^{[1
]}

Yang, Yingli ^{[1
]}

Zhang, Jin ^{[1
]}

Jia, Linyun ^{[1
]}

Li, Qiaoxia ^{[1
]}

Zhang, Tengguo ^{[1
]}

Qiao, Kexiong ^{[2
]}

Ma, Shengchun ^{[2
]}

机构：

[1] NW Normal Univ, Sch Life Sci, Lanzhou 730070, Peoples R China

[2] Environm Protect Bur, Lanzhou 730060, Peoples R China

来源：

ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY | 2012年 / 86卷

基金：

中国国家自然科学基金;

关键词：

Hydrogen peroxide; Superoxide radical; Root growth; Wheat; Zinc; INDUCED OXIDATIVE STRESS; CELL-WALL PEROXIDASE; HYDROGEN-PEROXIDE; SEED-GERMINATION; LIGNIFICATION; ALUMINUM; INHIBITION; SEEDLINGS; TOXICITY; EXCESS;

D O I：

10.1016/j.ecoenv.2012.09.021

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

This study investigated the inhibition mechanism of root growth in wheat seedlings when exposed to different zinc (Zn) concentrations. All applied Zn concentration did not affect seed germination, but reduced root length; in contrast, only Zn at 3 mM inhibited significantly the growth of shoot. The loss of cell viability and the significant increases of lignification as well as the increases of hydrogen peroxide (H2O2), superoxide radical (O-2(-)) and malondialdehyde levels were observed in the root tissue exposed to Zn treatment. And also, Zn stress led to the inhibition of cell-wall bound peroxidase. Moreover, NADPH oxidase inhibitor diphenylene iodonium could block greatly the elevation of O-2(-) generation in Zn-treated roots. Therefore, the increased H2O2 generation was dependent on the extracellular O-2(-) production derived from plasma membrane NADPH oxidase. In addition, the loss of cell viability and the significant increases of lignification in response to the highest Zn concentration may be associated with the remarkable reduction of root growth in wheat seedlings. (C) 2012 Elsevier Inc. All rights reserved.

引用

页码：198 / 203

页数：6

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