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

	The concentration of selenium matters: a field study on mercury accumulation in rice by selenite treatment in qingzhen, Guizhou, China
	Li YF(李玉锋); Zhao JT(赵甲亭); Li YY(李云云); Li HJ(李汉军); Li B(李柏); Gao YX(高愈希); Li, YF; Zhao, JT; Li, YY; Li, HJ
刊名	PLANT AND SOIL
	2015
卷号	391 期号:1-2 页码:195-205
关键词	Rice Mercury Selenium XRF XAS Seed setting rate Thousand seed weight
通讯作者	李玉锋
英文摘要	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 mu g/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 mu g/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 mu g/mL. Se concentrations over 0.5 mu g/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 mu g/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.
学科主题	Agriculture; Plant Sciences
类目[WOS]	Agronomy ; Plant Sciences ; Soil Science
收录类别	SCI ; CA
WOS记录号	WOS:000354197100014
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/228516]
专题	高能物理研究所_多学科研究中心
推荐引用方式 GB/T 7714	Li YF,Zhao JT,Li YY,et al. The concentration of selenium matters: a field study on mercury accumulation in rice by selenite treatment in qingzhen, Guizhou, China[J]. PLANT AND SOIL,2015,391(1-2):195-205.
APA	李玉锋.,赵甲亭.,李云云.,李汉军.,李柏.,...&Li, J.(2015).The concentration of selenium matters: a field study on mercury accumulation in rice by selenite treatment in qingzhen, Guizhou, China.PLANT AND SOIL,391(1-2),195-205.
MLA	李玉锋,et al."The concentration of selenium matters: a field study on mercury accumulation in rice by selenite treatment in qingzhen, Guizhou, China".PLANT AND SOIL 391.1-2(2015):195-205.