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	Arsenic accumulation and resistance mechanism in Panax notoginseng, a traditional rare medicinal herb
	Yan X. L. ; Lin L. Y. ; Liao X. Y. ; Zhang W. B.
	2012
关键词	Panax notoginseng Arsenic (As) Speciation Resistance Subcellular distribution Antioxidation pteris-vittata l. speciation plant
英文摘要	Panax notoginseng, a traditional rare Chinese medicinal herb, was recently found to bring health risk to consumers, mainly because soil in its major plantation area was contaminated by arsenic (As). We investigated the effect of soil As pollution on the growth and As uptake of pot-cultured P. notoginseng, and the associated mechanisms of As stressed response. Results showed that, comparing with P. notoginseng growing in a low-As soil, the root, stem, and leaf biomasses of those growing in a high-As soil significantly reduced by 0.75, 0.09 and 0.21 g seedling(-1), respectively. Arsenic concentrations in roots, stems and leaves of the seedlings growing in high-As soil were 22, 15 and 3 times higher than those growing in low-As soil, respectively. Regardless of the soil As concentration, As existed in plants mainly as As(III), suggesting that the reduction of As(V) is a key step in As metabolism. Arsenic was distributed primarily in cell walls (51.7% for plants growing in the low-As soil, and 51.5% in the high-As soil), followed by cytoplasm supernatant, with cell organelles containing the least As. Compared with plants growing in the low-As soil, those in the high-As soil had increased superoxide dismutase and peroxidase activities in their roots, stems, and leaves, which would be associate with improving the resistance of P. notoginseng to As stress. The results suggest that there exists some special mechanisms of As-tolerance in P. notoginseng and the study is of significance in developing measures to reduce As in the herb. (C) 2011 Elsevier Ltd. All rights reserved.
出处	Chemosphere
卷	87
期	1
页	31-36
收录类别	SCI
ISSN号	0045-6535
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/26727]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Yan X. L.,Lin L. Y.,Liao X. Y.,et al. Arsenic accumulation and resistance mechanism in Panax notoginseng, a traditional rare medicinal herb. 2012.

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