The concentration of selenium matters: a field study on mercury accumulation in rice by selenite treatment in qingzhen, Guizhou, China

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• 作者：Yu-Feng Li ; Jiating Zhao ; Yunyun Li ; Hanjun Li ; Junfang Zhang ; Bai Li…
• 关键词：Rice ; Mercury ; Selenium ; XRF ; XAS ; Seed setting rate ; Thousand seed weight
• 刊名：Plant and Soil
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：391
• 期：1-2
• 页码：195-205
• 全文大小：2,405 KB
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• 作者单位：Yu-Feng Li (1)
  Jiating Zhao (1)
  Yunyun Li (1)
  Hanjun Li (1)
  Junfang Zhang (2)
  Bai Li (1)
  Yuxi Gao (1)
  Chunying Chen (3)
  Manyi Luo (4)
  Rui Huang (4)
  Jun Li (4)
  
  1. State Environmental Protection Engineering Center for Mercury Pollution Prevention and Control, and CAS Key Laboratory for Biomedical Effects of Nanomateriasl and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
  2. Guizhou Institute of Environmental Science and Designing, Guiyang, 550081, China
  3. National Center for Nanoscience and Technology, Beijing, 100190, China
  4. Beijing National Day School, Beijing, 100039, China
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Sciences
  Soil Science and Conservation
  Plant Physiology
  Ecology
  
• 出版者：Springer Netherlands
• ISSN：1573-5036

文摘

Aims The consumption of rice grain produced in mercury (Hg) contaminated soil was identified as a major route of dietary Hg exposure. The aims were 1) to determine the most suitable concentration of Se that can lead to least Hg accumulation in rice grain in real Hg contaminated paddy field in Qingzhen, and 2) to elucidate the possible mechanism of the protection against the phytotoxicity of Hg in rice by Se. Methods Rice plants were treated with different concentrations (0, 0.01, 0.1, 0.5, 1 and 5?μg/mL) of sodium selenite in a real paddy field in Qingzhen, Guizhou, China. The concentrations of Hg and Se in soil, stream water, rice tissues, and the seed setting rate (SSR) and thousand seed weight (TSW) were checked. The distribution and chemical forms of Hg and Se in rice root were studied by XRF and XAS. Results Treating the rice plants with 0.5?μg/mL of sodium selenite achieved the lowest Hg accumulation in rice grain while the highest SSR and TSW. In rice root, XRF found decreased Hg uptake, and XAS found Hg-Se complexes were formed. These findings, together with the formation of biological barriers like iron plaque, could explain the decreased accumulation of Hg in rice grain at Se levels below 0.5?μg/mL. Se concentrations over 0.5?μg/mL led to increased Hg accumulation and decreased SSR and TSW, which were ascribed to the significantly increased Se accumulation in rice grain. Conclusions This field study suggest that treatment with appropriate level of Se (0.5?μg/mL in this study) is an efficient way to reduce Hg accumulation in rice and increase rice yield and quality, thereafter to protect the health of the rice-dependent populations in Hg-contaminated area.