title: Mechanisms controlling arsenic uptake in rice grown in mining impacted regions in South China.
abstract: Foods produced on soils impacted by Pb-Zn mining activities are a potential health risk due to plant uptake of the arsenic (As) associated with such mining. A field survey was undertaken in two Pb-Zn mining-impacted paddy fields in Guangdong Province, China to assess As accumulation and translocation, as well as other factors influencing As in twelve commonly grown rice cultivars. The results showed that grain As concentrations in all the surveyed rice failed national food standards, irrespective of As speciation. Among the 12 rice cultivars, "SY-89" and "DY-162" had the least As in rice grain. No significant difference for As concentration in grain was observed between the rice grown in the two areas that differed significantly for soil As levels, suggesting that the amount of As contamination in the soil is not necessarily the overriding factor controlling the As content in the rice grain. The iron and manganese plaque on the root surface curtailed As accumulation in rice roots. Based on our results, the accumulation of As within rice plants was strongly associated with such soil properties such as silicon, phosphorus, organic matter, pH, and clay content. Understanding the factors and mechanisms controlling As uptake is important to develop mitigation measures that can reduce the amount of As accumulated in rice grains produced on contaminated soils.
authors.affiliation: College of Natural Resources and Environment, South China Agricultural University, Guangzhou, China.
authors.forename: Junhui
authors.initials: J
authors.lastname: Li
authors.affiliation: College of Natural Resources and Environment, South China Agricultural University, Guangzhou, China; Agricultural Bureau of Xiangfen County, Shanxi Province, Xiangfen, China.
authors.forename: Fei
authors.initials: F
authors.lastname: Dong
authors.affiliation: College of Natural Resources and Environment, South China Agricultural University, Guangzhou, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Lu
authors.affiliation: Institute of Wheat Research, Shanxi Academy of Agricultural Sciences, Linfen, China.
authors.forename: Qiuyan
authors.initials: Q
authors.lastname: Yan
authors.affiliation: Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Macau SAR, China.
authors.forename: Hojae
authors.initials: H
authors.lastname: Shim
mesh_terms: D001151:Arsenic / Q000032:analysis*; D002681:China; D004784:Environmental Monitoring / Q000379:methods; D005506:Food Contamination / Q000032:analysis; D007501:Iron / Q000032:analysis; D008345:Manganese / Q000032:analysis; D008906:Mining; D012275:Oryza / Q000737:chemistry* / Q000145:classification; D018517:Plant Roots / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis*
chemical_list: D012989:Soil Pollutants; D008345:Manganese; D007501:Iron; D001151:Arsenic