Thioarsenate Toxicity and Tolerance in the Model System Arabidopsis thaliana

Environmental Science & Technology
Britta Planer-FriedrichStephan Clemens

Abstract

Thioarsenates form from arsenite under sulfate-reducing conditions, e.g., in rice paddy soils, and are structural analogues of arsenate. Even though rice is one of the most important sources of human arsenic intake, nothing is published about uptake, toxicity, or tolerance of thioarsenates in plants. Experiments using the model system Arabidopsis thaliana showed that monothioarsenate is less toxic than arsenite, but more toxic than arsenate at concentrations ≥25 μM As, reflected in stronger seedling growth inhibition on agar plates. Despite higher toxicity, total As accumulation in roots was lower upon exposure to monothioarsenate compared to arsenate, and a higher root efflux was confirmed. Root-shoot translocation was higher for monothioarsenate than for arsenate. Compared to the wild type (Col-0), both arsenate and monothioarsenate induced higher toxicity in phytochelatin (PC)-deficient mutants (cad1-3) as well as in glutathione biosynthesis (cad2) and PC transport (abcc12) mutants, demonstrating the important role of the PC pathway, not only for arsenate, but also for monothioarsenate detoxification. In Col-0, monothioarsenate induced relatively higher accumulation of PCs than arsenate. The observed differences in plant upt...Continue Reading

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Citations

Aug 14, 2019·Journal of Experimental Botany·Stephan Clemens
Jun 21, 2021·Chemosphere·Aditi Shreeya Bali, Gagan Preet Singh Sidhu
Jul 20, 2018·Environmental Science & Technology·Carolin F KerlBritta Planer-Friedrich

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