Selenium in Soil Inhibits Mercury Uptake and Translocation in Rice (Oryza sativa L.)

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• 作者：Hua Zhang ; Xinbin Feng ; Jianming Zhu ; Atindra Sapkota ; Bo Meng ; Heng Yao ; Haibo Qin ; Thorj酶rn Larssen
• 刊名：Environmental Science & Technology (ES&T)
• 出版年：2012
• 出版时间：September 18, 2012
• 年：2012
• 卷：46
• 期：18
• 页码：10040-10046
• 全文大小：345K
• 年卷期：v.46,no.18(September 18, 2012)
• ISSN：1520-5851

文摘

A great number of studies have confirmed that mercury鈥搒elenium (Hg鈥揝e) antagonism is a widespread phenomenon in microorganisms, fish, poultry, humans, and other mammals. However, by comparison, little attention has been paid to plants. To investigate the influence of Se on the uptake and translocation of methylHg/inorganic Hg (MeHg/IHg) in the rice鈥搒oil system, we determined the levels of Se, IHg, and MeHg in different parts of rice plants (including the root, stem, leaf, husk, and grain (brown rice)) and corresponding soils of root zones collected from a Hg mined area, where Hg and Se co-occur due to historic Hg mining and retorting activities. The results showed that, in general, the Se levels were inversely related to the levels of both IHg and MeHg in the grains. In addition, a consistent reduction in translocation of both IHg and MeHg in the aerial shoots (i.e., the stem, leaf, husk, and grain) with increasing Se levels in the soils was observed. Furthermore, the Se levels were positively correlated with the IHg levels in the soils and the roots. These results suggest that Se may play an important role in limiting the bioaccessibility, absorption, and translocation/bioaccumulation of both IHg and MeHg in the aerial rice plant, which may be related to the formation of an Hg鈥揝e insoluble complex in the rhizospheres and/or roots.