Excessive sulfur supply reduces arsenic accumulation in brown rice

J. Fan, X. Xia, Z. Hu, N. Ziadi and C. Liu
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J. Fan: State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, P.R. China
X. Xia: Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agriculture Sciences, Beijing, P.R. China
Z. Hu: College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, P.R. China
N. Ziadi: Soils and Crops Research and Development Centre, Agriculture and Agri-Food, Quebec, Canada
C. Liu: Jiangsu Key Laboratory of Agricultural Meteorology, College of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing, P.R. China

Plant, Soil and Environment, 2013, vol. 59, issue 4, 169-174

Abstract: The objective of this study was to investigate the influence of excessive sulfur (S) supply on iron plaque formation and arsenic (As) accumulation in rice plants. A combined soil-sand pot experiment was conducted by using two As levels (0, 20 mg/kg) combined with three S concentrations (0, 60, 120 mg/kg). The results showed that excessive S supply significantly decreased As concentration in brown rice, but As concentration in root increased with increasing rate of S supply. Moreover, bioconcentration factors for leaves and stems were 8-35 fold of that for brown rice, indicating that As was mainly accumulated in rice leaves and stems instead of brown rice. Furthermore, excessive S supply significantly decreased translocation factor of As compared to treatment without S supply. These results indicated that excessive S may reduce As translocation from soils and roots to grain. The mechanism could be ascribed to excessive S that induced the decrease of As availability, the increase of iron plaque formation under As stress, and the increase of glutathione in rice leaves and roots. Therefore, excessive S can reduce As accumulation in brown rice exposed to As contaminated soils though it may result in loss of rice yield.

Keywords: arsenic toxicity; glutathione; iron plaque; Oryza sativa L.; plant uptake (search for similar items in EconPapers)
Date: 2013
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlpse:v:59:y:2013:i:4:id:882-2012-pse

DOI: 10.17221/882/2012-PSE

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