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An X-ray absorption spectroscopy investigation of speciation and biotransformation of copper in Elsholtzia splendens
Shi, JY; Wu, B; Yuan, XF; Cao, YY; Chen, XC; Chen, YX; Hu, TD; Hu TD(胡天斗)
2008
Source PublicationPLANT AND SOIL
Volume302Issue:1-2Pages:#REF!
Corresponding AuthorShi, JY (reprint author), Zhejiang Univ, Dept Environm Engn, Huajiachi Campus,268 Kaixuan Rd, Hangzhou 310029, Zhejiang, Peoples R China.
SubtypeArticle
AbstractElsholtzia splendens is a Cu-tolerant plant growing in copper mine areas in the south of China. In this study, X-ray absorption spectroscopy (XAS) was used to investigate the Cu speciation and biotransformation in E. splendens with 300 mu M Cu treatment from 10 days to 60 days. The results showed that 300 mu M Cu was phytotoxic to E. spendens. The Cu K-edge X-ray absorption near edge structure (XANES) revealed that most copper in roots, stems and leaves exists as divalent Cu. Cu speciation changed depending on the treatment time, but there was no unidirectional trend in roots, stems, and leaves. The percentages of potential Cu ligands in all samples were estimated by fitting the XANES spectra with linear combinations. Most Cu in roots, stems and leaves was bound with cell wall and histidine (His)-like ligands, while a minor proportion of the Cu was bound to oxalate and glutathione-like ligands. The fitting results of Cu K-edge extended X-ray absorption fine structure (EAXFS) showed that nitrogen/oxygen (N/O) ligands were dominant in roots, stems and leaves of the plant, while S ligands were rare. All these results suggest that Cu bound by N/O ligands plays a key role in Cu detoxification of E. splendens, and a role for classical metal-detoxifying S ligands, such as metallothioneins and phytochelatins, in Cu detoxification of E. splendens is not supported in the present study. Due to the phytotoxicity of 300 mu M Cu to E. splendens, the question of whether S ligands play a significant role in Cu detoxification in E. splendens exposed to lower levels of Cu should be further studied.
KeywordElsholtzia splendens copper cell wall ligands X-ray absorption spectroscopy
Subject AreaAgriculture; Plant Sciences
DOI10.1007/s11104-007-9463-6
Indexed BySCI
WOS SubjectAgronomy ; Plant Sciences ; Soil Science
WOS IDWOS:000251971500013
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Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/226611
Collection多学科研究中心
Recommended Citation
GB/T 7714
Shi, JY,Wu, B,Yuan, XF,et al. An X-ray absorption spectroscopy investigation of speciation and biotransformation of copper in Elsholtzia splendens[J]. PLANT AND SOIL,2008,302(1-2):#REF!.
APA Shi, JY.,Wu, B.,Yuan, XF.,Cao, YY.,Chen, XC.,...&胡天斗.(2008).An X-ray absorption spectroscopy investigation of speciation and biotransformation of copper in Elsholtzia splendens.PLANT AND SOIL,302(1-2),#REF!.
MLA Shi, JY,et al."An X-ray absorption spectroscopy investigation of speciation and biotransformation of copper in Elsholtzia splendens".PLANT AND SOIL 302.1-2(2008):#REF!.
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