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Thioarsenate toxicity and tolerance in the model system Arabidopsis thaliana

Title data

Planer-Friedrich, Britta ; Kühnlenz, Tanja ; Halder, Dipti ; Lohmayer, Regina ; Wilson, Nathaniel ; Rafferty, Colleen ; Clemens, Stephan:
Thioarsenate toxicity and tolerance in the model system Arabidopsis thaliana.
In: Environmental Science & Technology. Vol. 51 (29 May 2017) Issue 12 . - pp. 7187-7196.
ISSN 0013-936X
DOI: https://doi.org/10.1021/acs.est.6b06028

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

Thioarsenates form from arsenite under sulfate-reducing conditions, e.g. in rice paddy soils, and are structural analogues to arsenate. Even though rice is one of the most important sources of human arsenic (As) 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 \textgreater= 25 µM As, reflected in stronger seedlings 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 uptake, toxicity, and tolerance of thio- vs. oxyarsenate show that studying the effects of As on plants should include experiments with thiolated As species.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER140936
BAYCEER142167
Institutions of the University: Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Plant Physiology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Plant Physiology > Chair Plant Physiology - Univ.-Prof. Dr. Stephan Clemens
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professorship Environmental Geochemistry Group
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professorship Environmental Geochemistry Group > Professorship Environmental Geochemistry - Univ.-Prof. Dr. Britta Planer-Friedrich
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Result of work at the UBT: Yes
DDC Subjects: 500 Science
500 Science > 570 Life sciences, biology
500 Science > 580 Plants (Botany)
Date Deposited: 09 Jan 2018 15:05
Last Modified: 10 Jan 2018 08:21
URI: https://eref.uni-bayreuth.de/id/eprint/41554