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	A comparison of arsenic accumulation and tolerance among four populations of Pteris vittata from habitats with a gradient of arsenic concentration
	Gao D.; Lei M.
	2013
关键词	Arsenic Hyperaccumulation Intraspecific difference Uptake kinetics XANES (X-ray absorption near-edge structure) chinese brake fern metallicolous populations cadmium accumulation thlaspi-caerulescens metal tolerance sedum-alfredii water status hyperaccumulator phytoremediation plant
英文摘要	Arsenic (As) contamination poses a high risk to human health. Phytoremediation based on As hyperaccumulator Pteris vittata has been utilized on large areas of contaminated farmland in southern China. However, the reason for the observed differences in As removal among P. vittata populations remains unclear. In this study, spores of four P. vittata populations were collected from four neighboring sites with varying soil As concentration (from 108 mg.kg(-1) to 7527 mg.kg(-)1) and then cultured in a controlled environment to analyze their differing abilities in terms of As accumulation and tolerance. The results indicate that populations from low-As habitats exhibited 80% greater shoot As concentrations compared with those from high-As habitats. On the other hand, populations from high-As habitats exhibited approximately five times greater biomass compared with those from low-As habitats when exposed to the same As stress. Thus, the As accumulation and tolerance of P. vittata were suggested to be two independent processes. Further investigations reveal that the As absorption and As species conversion occurring in roots are two essential activities that bridge the soil As concentration and the responses of P. vittata to As. Depending on the As concentration of the target soil, the selection of different P. vittata populations can result in approximately an eight-fold difference in terms of remediation efficiency. (C) 2012 Elsevier B.V. All rights reserved.
出处	Science of the Total Environment
卷	442
页	143-151
收录类别	SCI
语种	英语
ISSN号	0048-9697
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/30221]
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	Gao D.,Lei M.. A comparison of arsenic accumulation and tolerance among four populations of Pteris vittata from habitats with a gradient of arsenic concentration. 2013.

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