Arsenic uptake and speciation in Arabidopsis thaliana under hydroponic conditions.

Abstract:

: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.

journal_name

Chemosphere

journal_title

Chemosphere

authors

Park JH,Han YS,Seong HJ,Ahn JS,Nam IH

doi

10.1016/j.chemosphere.2016.03.126

subject

Has Abstract

pub_date

2016-07-01 00:00:00

pages

283-288

eissn

0045-6535

issn

1879-1298

pii

S0045-6535(16)30450-7

journal_volume

154

pub_type

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