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	Effects of exogenous organic chelators on phytochelatins production and its relationship with cadmium toxicity in wheat (Triticum aestivum L.) under cadmium stress
	Sun Q. ; Wang X. R. ; Ding S. M. ; Yuan X. F.
	2005
关键词	organic chelator phytochelatins cadmium toxicity biomarker wheat (Triticum aestivum L.) tolerant silene vulgaris metal-binding peptides oxidative stress holcus-lanatus glutathione plants copper accumulation phytoplankton biomarkers
英文摘要	Phytochelatins (PCs) have been proposed as a potential biomarker for metal toxicity. In this study, cadmium (Cd) toxicity, PCs production and their relationship in wheat under Cd stress were examined using various exogenous organic chelator-buffered nutrient solutions. Single Cd stress produced strong toxic effects, as indicated by decreases of growth parameters, high level of lipid peroxidation in leaf and overproduction of PCs in root. Exogenous organic chelators with proper dose more or less reduced Cd toxicity by increasing growth parameters and decreasing lipid peroxidation in leaves. Of organic chelators (EDTA, DTPA, citric acid, malic acid and oxalic acid), EDTA was the most effective in decreasing Cd toxicity in plants, followed by DTPA and citric acid. Simultaneously, the concentrations of Cd-induced PCs in roots decreased, and the greatest decrease was caused by application of EDTA and DTPA. Linearly positive relationships were observed between Cd toxicity and root PCs concentrations under the influences of organic chelators, particularly EDTA, DTPA and citric acid. Furthermore, present results provide stronger evidence that PCs synthesis in plant cells was related to free Cd ion concentrations, not total Cd, and demonstrate that the levels of PCs production in plants correlated well with toxic effects caused by the bioavailable Cd levels. (c) 2005 Elsevier Ltd. All rights reserved.
出处	Chemosphere
卷	60
期	1
页	22-31
收录类别	SCI
语种	英语
ISSN号	0045-6535
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/23039]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Sun Q.,Wang X. R.,Ding S. M.,et al. Effects of exogenous organic chelators on phytochelatins production and its relationship with cadmium toxicity in wheat (Triticum aestivum L.) under cadmium stress. 2005.

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