The process of methylmercury accumulation in rice (Oryza sativa L.).
The process of methylmercury accumulation in rice (Oryza sativa L.).
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DOI：
10.1021/es103384v
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发表时间：
2011-03
影响因子：
11.4
通讯作者：
B. Meng;Xinbin Feng;G. Qiu;P. Liang;Ping Li;Chunxiao Chen;L. Shang
中科院分区：
文献类型：
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作者：
B. Meng;Xinbin Feng;G. Qiu;P. Liang;Ping Li;Chunxiao Chen;L. Shang
最近的研究表明，大米消费可能是汞矿区和中国西南部某些内陆地区人类甲基汞（MeHg）暴露的重要途径。与其他组织相比，水稻种子积累甲基汞的能力最强。本研究的主要目的是研究甲基汞在水稻种子中的积累过程。通过监测在水稻生长季节中遭受不同程度汞多重污染的水稻植株特定组织中的甲基汞水平。利用了四组实验种植园，分布在一个农村手工汞生产点和一个区域背景控制点之间。结果表明，新沉积的Hg在水稻植株中比在土壤中停留时间较长的Hg更容易转化为MeHg并积累，土壤是MeHg在水稻植株组织中的潜在来源。土壤中的甲基汞首先被根系吸收，然后转移到地上部分（叶和茎）。在整个水稻生长季节，只有极少量的甲基汞保留在根部。在早熟植株中，大部分甲基汞位于叶片和茎中;然而，大部分甲基汞在成熟期转移到种子中。
Recent studies have shown that rice consumption can be an important pathway of methylmercury (MeHg) exposure to humans in Hg mining areas and also in certain inland areas of Southwestern China. The seed of rice has the highest ability to accumulate MeHg compared to other tissues. The main objective of this study was to investigate the process of (MeHg) accumulation in rice seed (Oryza sativa L.) by monitoring MeHg levels in specific tissues of rice plants experiencing various levels of Hg multisource pollution during a full rice growing season. Four groups of experimental plantations were utilized, distributed among a rural artisanal Hg production site and a regional background control site. Our results suggest that the newly deposited Hg is more readily transformed to MeHg and accumulated in rice plants than Hg forms with an extended residence time in soil, and soil is the potential source of MeHg in the tissues of rice plants. MeHg in soil was first absorbed by roots and then translocated to the above-ground parts (leaf and stalk). During the full rice growing season only a very small amount of MeHg was retained in the root section. In the premature plant, the majority of MeHg is located in the leaf and stalk; however, most of this MeHg was transferred to seed during the ripening period.