NDLI: Mercury modulates selenium activity via altering its accumulation and speciation in garlic (Allium sativum)

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Metallomics Vol - 5 Issue - 6

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Metallomics Vol - 5 Issue - 2

Mercury modulates selenium activity via altering its accumulation and speciation in garlic (Allium sativum)

Content Provider	Royal Society of Chemistry (RSC)
Author	Hu, Yi Gao, Yuxi Dong, Yuanxing Chai, Zhifang Zhao, Jiating Li, Bai Li, Yufeng
Copyright Year	2013
Abstract	Combined pollution of selenium (Se) and mercury (Hg) has been known in Wanshan district (Guizhou Province, China). A better understanding of how Se and Hg interact in plants and the phytotoxicity thereof will provide clues about how to avoid or mitigate adverse effects of Se/Hg on local agriculture. In this study, the biological activity of Se has been investigated in garlic with or without Hg exposure. Se alone can promote garlic growth at low levels (<0.1 mg L−1), whereas it inhibits garlic growth at high levels (>1 mg L−1). The promotive effect of Se in garlic can be enhanced by low Hg exposure (<0.1 mg L−1). When both Se and Hg are at high levels, there is a general antagonistic effect between these two elements in terms of phytotoxicity. Inductively coupled plasma mass spectrometry (ICP-MS) data suggest that Se is mainly concentrated in garlic roots, compared to the leaves and the bulbs. Se uptake by garlic in low Se medium (<0.1 mg L−1) can be significantly enhanced as Hg exposure levels increase (P < 0.05), while it can be inhibited by Hg when Se exposure levels exceed 1 mg L−1. The synchrotron radiation X-ray fluorescence (SRXRF) mapping further shows that Se is mainly concentrated in the stele of the roots, bulbs and the veins of the leaves, and Se accumulation in garlic can be reduced by Hg. The X-ray absorption near edge structure (XANES) study indicates that Se is mainly formed in C–Se–C form in garlic. Hg can decrease the content of inorganic Se mainly in SeO32− form in garlic while increasing the content of organic Se mainly in C–Se–C form (MeSeCys and its derivatives). Hg-mediated changes in Se species along with reduced Se accumulation in garlic may account for the protective effect of Hg against Se phytotoxicity.
Starting Page	896
Ending Page	903
Page Count	8
File Format	HTM / HTML PDF
ISSN	17565901
Volume Number	5
Issue Number	7
Journal	Metallomics
DOI	10.1039/c3mt20273a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	X-ray absorption near edge structure Guizhou Wanshan Phytotoxicity X-ray fluorescence China Wanshan Special Vehicle Guizhou Province Methylmercury Drug interaction Garlic Stele Selenium Inductively coupled plasma mass spectrometry X-ray absorption spectroscopy Synchrotron
Content Type	Text
Resource Type	Article
Subject	Chemistry Medicine Metals and Alloys Biochemistry Biomaterials Biophysics

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