Journal
CHEMOSPHERE
Volume 154, Issue -, Pages 283-288Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2016.03.126
Keywords
Arsenite; Arsenate; Biotransformation; Phytochelatin; Glutathione; Sulfur
Categories
Funding
- Basic Research Project of the Korea Institute of Geoscience and Mineral Resources (KIGAM) - Ministry of Science, ICT and Future Planning of Korea
- MSIP
- POSTECH
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Arsenic (As) uptake and species in Arabidopsis thaliana were evaluated under hydroponic conditions. Plant nutrient solutions were treated with arsenite [As(III)] or arsenate [As(V)], and aqueous As speciation was conducted using a solid phase extraction (SPE) cartridge. Arabidopsis reduced As(V) to As(III) in the nutrient solution, possibly due to root exudates such as organic acids or the efflux of As(III) from plant roots after in vivo reduction of As(V) to As(III). Arsenic uptake by Arabidopsis was associated with increased levels of Ca and Fe, and decreased levels of K in plant tissues. Arsenic in Arabidopsis mainly occurred as As(III), which was coordinated with oxygen and sulfur based on XANES and EXAFS results. The existence of As(III)-O and As(III)-S in EXAFS indicates partial biotransformation of As(III)-O to a sulfur-coordinated form because of limited amount of glutathione in plants. Further understanding the mechanism of As biotransformation in Arabidopsis may help to develop measures that can mitigate As toxicity via genetic engineering. (C) 2016 Elsevier Ltd. All rights reserved.
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