Plant Soil Environ., 2013, 59(4):169-174 | DOI: 10.17221/882/2012-PSE

Excessive sulfur supply reduces arsenic accumulation in brown riceOriginal Paper

J. Fan1, X. Xia2, Z. Hu3, N. Ziadi4, C. Liu5
1 State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, P.R. China
2 Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agriculture Sciences, Beijing, P.R. China
3 College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, P.R. China
4 Soils and Crops Research and Development Centre, Agriculture and Agri-Food, Quebec, Canada
5 Jiangsu Key Laboratory of Agricultural Meteorology, College of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing, P.R. China

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

Published: April 30, 2013  Show citation

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Fan J, Xia X, Hu Z, Ziadi N, Liu C. Excessive sulfur supply reduces arsenic accumulation in brown rice. Plant Soil Environ. 2013;59(4):169-174. doi: 10.17221/882/2012-PSE.
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