Accumulation, translocation and conversion of six arsenic species in rice plants grown near a mine impacted city
Accumulation, translocation and conversion of six arsenic species in rice plants grown near a mine impacted city
复制标题
受矿井影响的城市附近种植的水稻中六种砷的积累、转移和转化
DOI：
10.1016/j.chemosphere.2017.05.089
复制
发表时间：
2017
期刊：
影响因子：
8.8
通讯作者：
Yang Zhaoguang
中科院分区：
文献类型：
--
作者：
Ma Li;Wang Lin;Jia Yuyu;Yang Zhaoguang
水稻（Oryza sativaL.）水稻是我国的主要粮食作物，由于在淹水的水稻土中种植，砷（As）是一种有效的积累物。水稻对砷的吸收和转运依赖于砷的形态。本研究以长沙附近的水稻田为研究对象，采集了水稻植株的根、秸秆、谷粒以及根际土壤样品。土壤中总砷含量从高到低依次为根>土壤>秸秆>籽粒。水稻植株中砷的主要形态为无机形态：亚砷酸盐[As（III）]和砷酸盐[As（V）]。除甲基胂酸盐（MMA）和二甲基胂酸盐（DMA）外，还检测到砷甜菜碱（AsB）和砷胆碱（AsC）。DMA和AsB主要在微生物的帮助下在水稻根部形成。MMA和AsC的检测秸秆可能来自甲基化和氧化的As（III）。多元线性回归结果表明，秸秆砷形态对粮食砷形态有显著的预测作用。MMA、DMA和AsC在从秸秆向籽粒转移时会发生脱甲基或降解。
Paddy rice (Oryza sativaL.) as the staple food in China was found to be efficient in accumulating arsenic (As) due to cultivated in flooded paddy soil. Uptake and translocation of As in rice plant depended on the As species. In this work, rice plant samples including roots, straws and grains as well as rhizosphere soils were collected from paddy fields near Changsha, a mine impacted city in Southern China. The total As concentrations in the collected samples were observed in the descending order as root > soil > straw > grain. The predominant As species detected in rice plants were inorganic forms: arsenite [As(III)] and arsenate [As(V)]. Except monomethylarsonate (MMA) and dimethylarsinate (DMA), other two organoarsenicals, arsenobetaine (AsB) and arsenocholine (AsC), were also detected in rice plants. DMA and AsB were mainly formed in rice roots with the assistance of microorganisms. MMA and AsC detected in straws might be derived from methylation and oxidation of As(III). The results of multiple linear regressions indicated that the straw As species were remarkable predictors of the corresponding grain As species. Demethylation or degradation of MMA, DMA and AsC were predicted when translocated from straw to grain.