Influences of high-level atmospheric gaseous elemental mercury on methylmercury accumulation in maize (Zea mays L.)

doi:10.1016/j.envpol.2020.114890

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	Influences of high-level atmospheric gaseous elemental mercury on methylmercury accumulation in maize (Zea mays L.)
	Sun, Ting 1,2; Wang, Zhangwei 1,3; Zhang, Xiaoshan 1,3; Niu, Zhenchuan 4; Chen, Jian 1
通讯作者	Wang, Zhangwei(wangzhw@rcees.ac.cn)
	2020-10-01
发表期刊	ENVIRONMENTAL POLLUTION
ISSN	0269-7491
卷号	265 期号:PT A 页码:9
摘要	Maize (Zea mays L.) leaves play an important role in stomatal uptake and surface adsorption of atmospheric mercury (Hg). However, the influence of atmospheric gaseous elemental mercury (GEM) on methylmercury (MeHg) accumulation in maize plants is poorly understood. In this study, we conducted a field open-top chambers (OTCs) experiment and a soil Hg-enriched experiment to investigate the response of MeHg accumulation in maize tissues to different GEM levels in the air. Maize upper leaves had a higher average MeHg concentration (0.21 +/- 0.08 ng g(-1)) than bottom leaves (0.15 +/- 0.05 ng g(-1)) in the OTCs experiment, which was inconsistent with that in the soil Hg-enriched experiment (maize upper leaves: 0.41 +/- 0.07 ng g(-1), maize bottom leaves: 0.60 +/- 0.05 ng g(-1)). Additionally, significantly positive correlations were found between MeHg concentrations in maize leaves and air Hg levels, suggesting that elevated air Hg levels enhanced MeHg accumulation in maize leaves, which was possibly attributed to methylation of Hg on leaf surfaces. Mature maize grains from the OTCs experiment had low MeHg concentrations (0.12-0.23 ng g(-1)), suggesting a low accumulation capability of MeHg by maize grains. Approximately 93-96% of MeHg and 51-73% of total Hg in maize grains were lost from the grain-filling stage to the grain-ripening stage at all GEM level treatments, implying that self-detoxification in maize grains occurred. MeHg concentrations in maize roots showed a significant linear relationship (R-2 = 0.98, p < 0.01) with soil Hg levels, confirming that MeHg in maize roots is primarily from soil. This study provides a new finding that elevated air GEM levels could enhance MeHg accumulation in maize leaves, and self-detoxification may occur in maize grains. Further studies are needed to clarify these mechanisms of Hg methylation on maize leaf surfaces and self-detoxification of Hg by maize grains. (C) 2020 Published by Elsevier Ltd.
关键词	Maize Atmospheric gaseous elemental mercury Methylmercury Accumulation
DOI	10.1016/j.envpol.2020.114890
关键词[WOS]	ORYZA-SATIVA ; INORGANIC MERCURY ; ABIOTIC METHYLATION ; DRY DEPOSITION ; RICE PLANTS ; TRANSLOCATION ; TRANSFORMATION ; EXTRACTION ; EMISSIONS ; SOILS
收录类别	SCI ; SCI
语种	英语
资助项目	National Key Research and Development Program of China[2017YFC0210106] ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP)[2019QZKK0307-03-001] ; National Natural Science Foundation of China[41673113] ; National Natural Science Foundation of China[41373124]
WOS研究方向	Environmental Sciences & Ecology
项目资助者	National Key Research and Development Program of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; National Natural Science Foundation of China
WOS类目	Environmental Sciences
WOS记录号	WOS:000558886200071
出版者	ELSEVIER SCI LTD
引用统计
文献类型	期刊论文
条目标识符	http://ir.ieecas.cn/handle/361006/15163
专题	加速器质谱中心
通讯作者	Wang, Zhangwei
作者单位	1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing 100085, Peoples R China 2.Western Univ, London, ON N6A 3K7, Canada 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Chinese Acad Sci, Inst Earth Environm, Xian 710061, Peoples R China
推荐引用方式 GB/T 7714	Sun, Ting,Wang, Zhangwei,Zhang, Xiaoshan,et al. Influences of high-level atmospheric gaseous elemental mercury on methylmercury accumulation in maize (Zea mays L.)[J]. ENVIRONMENTAL POLLUTION,2020,265(PT A):9.
APA	Sun, Ting,Wang, Zhangwei,Zhang, Xiaoshan,Niu, Zhenchuan,&Chen, Jian.(2020).Influences of high-level atmospheric gaseous elemental mercury on methylmercury accumulation in maize (Zea mays L.).ENVIRONMENTAL POLLUTION,265(PT A),9.
MLA	Sun, Ting,et al."Influences of high-level atmospheric gaseous elemental mercury on methylmercury accumulation in maize (Zea mays L.)".ENVIRONMENTAL POLLUTION 265.PT A(2020):9.