Differential generation of hydrogen peroxide upon exposure to zinc and cadmium in the hyperaccumulating plant specie(Sedum alfredii Hance)

作     者：Yue-en CHAO Min ZHANG Sheng-ke TIAN Ling-li LU Xiao-e YANG 

作者机构：MOE Key Laboratory of Environmental Remediation and Ecosystem Health College of Environmental and Resource Sciences Zhejiang University Hangzhou 310029 China 

出 版 物：《Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)》 (浙江大学学报（英文版）B辑（生物医学与生物技术）)

年 卷 期：2008年第9卷第3期

页      面：243-249页

核心收录：

学科分类：12[管理学] 1204[管理学-公共管理] 

基　　金：Project (Nos. 30630046 and 20777068) supported by the National Natural Science Foundation of China 

主　　题：Hydrogen peroxide (H2O2) Glutathione (GSH) Sedum alfredii Hance Zinc (Zn) Cadmium (Cd) Hyperaccumulator 

摘      要：Sedum alfredii Hance has been identified as zinc(Zn) and cadmium(Cd) *** this paper the relationships of Zn or Cd hyperaccumulation to the generation and the role of H2O2 in Sedum alfredii *** *** results show that Zn and Cd contents in the shoots of Sedum alfredii *** with 1000 μmol/L Zn2+ and/or 200 μmol/L Cd2+ increased linearly within 15 *** of total S,glutathione(GSH) and H2O2 in shoots also increased within 15 d,and then *** S and GSH contents in shoots were higher under Cd2+ treatment than under Zn2+ ***,reverse trends of H2O2 content in shoots were obtained,in which much higher H2O2 content was observed in Zn2+-treated shoots than in Cd2+-treated ***,the microscopic imaging of H2O2 accumulation in leaves using H2O2 probe technique showed that much higher H2O2 accumulation was observed in the Zn2+-treated leaf than in the Cd2+-treated *** results suggest that there are different responses in the generation of H2O2 upon exposure to Zn2+ and Cd2+ for the hyperaccumulator Sedum alfredii *** this is the first report that the generation of H2O2 may play an important role in Zn hyperaccumulation in the *** results also imply that GSH may play an important role in the detoxification of dissociated Zn/Cd and the generation of H2O2.