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Mechanistic understanding of MeHg-Se antagonism in soil-rice systems: the key role of antagonism in soil
Wang, YJ; Dang, F; Evans, RD; Zhong, H; Zhao, JT; Zhou, DM; Zhao JT(赵甲亭)
2016
发表期刊SCIENTIFIC REPORTS
卷号6
文章类型期刊论文
摘要Methylmercury (MeHg) accumulation in rice has great implications for human health. Here, effects of selenium (Se) on MeHg availability to rice are explored by growing rice under soil or foliar fertilization with Se. Results indicate that soil amendment with Se could reduce MeHg levels in soil and grain (maximally 73%). In contrast, foliar fertilization with Se enhanced plant Se levels (3-12 folds) without affecting grain MeHg concentrations. This evidence, along with the distinct distribution of MeHg and Se within the plant, demonstrate for the first time that Se-induced reduction in soil MeHg levels (i.e., MeHg-Se antagonism in soil) rather than MeHg-Se interactions within the plant might be the key process triggering the decreased grain MeHg levels under Se amendment. The reduction in soil MeHg concentrations could be mainly attributed to the formation of Hg-Se complexes (detected by TEM-EDX and XANES) and thus reduced microbial MeHg production. Moreover, selenite and selenate were equally effective in reducing soil MeHg concentrations, possibly because of rapid changes in Se speciation. The dominant role of Se-induced reduction in soil MeHg levels, which has been largely underestimated previously, together with the possible mechanisms advance our mechanistic understanding about MeHg dynamics in soil-rice systems.
DOI10.1038/srep19477
关键词[WOS]ORYZA-SATIVA-L. ; MERCURY UPTAKE ; DESULFOVIBRIO-DESULFURICANS ; METHYL MERCURY ; HG ANTAGONISM ; SELENIUM ; METHYLMERCURY ; CHINA ; BIOAVAILABILITY ; SEDIMENTS
语种英语
WOS类目Multidisciplinary Sciences
WOS记录号WOS:000387314400001
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文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/260401
专题多学科研究中心
作者单位中国科学院高能物理研究所
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GB/T 7714
Wang, YJ,Dang, F,Evans, RD,et al. Mechanistic understanding of MeHg-Se antagonism in soil-rice systems: the key role of antagonism in soil[J]. SCIENTIFIC REPORTS,2016,6.
APA Wang, YJ.,Dang, F.,Evans, RD.,Zhong, H.,Zhao, JT.,...&赵甲亭.(2016).Mechanistic understanding of MeHg-Se antagonism in soil-rice systems: the key role of antagonism in soil.SCIENTIFIC REPORTS,6.
MLA Wang, YJ,et al."Mechanistic understanding of MeHg-Se antagonism in soil-rice systems: the key role of antagonism in soil".SCIENTIFIC REPORTS 6(2016).
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