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Accumulation and speciation of selenium in Cardamine sp. in Yutangba Se Mining Field, Enshi, China
Shuxun Shao;  Guodong Deng;  Xiubo Mi;  Shengqiao Long;  Jing Zhang;  Jun Tang
2014
发表期刊Chinese Journal of Geochemistry
卷号33期号:4页码:357-364
摘要

A naturally selenium-accumulating Cardamine sp. is growing in Yutangba Selenium Mining Field, Enshi area, Hubei Province, China, where the geochemical environment is selenium-enriched and endemic selenosis ever occurred in humans. The present study investigated the characteristics of accumulation, speciation and quantity of selenium in Cardamine sp. with HPLC-ICP-MS. Results show that Cardamine sp. can accumulate Se at most 1427 mg/kg in seedling leaves. Even after the biomass incensement of growing up, the plant still could accumulate Se up to several hundred of mg/kg in concentration. Moreover, the biomass enrichment coefficient (BEC) of Se is exceedingly high, in the seedling leaves mostly, higher than 50 mg/kg; in the range of 43.7–68 mg/kg; and the lowest value is higher than 3 mg/kg in mature fronds. Se is present in the plant predominantly in form of SeCys2 with the highest concentration in seeds; up to 1081 mg/kg as Se. In contrast, SeCys2 levels are low during early growth period; they are 136.1 mg/kg as Se in seedling fronds and 39.4 mg/kg as Se in mature fronds, respectively. SeMet concentration is comparatively low; 10.6 mg/kg as Se in seedling frond and 5.3 mg/kg as Se in half mature fronds, respectively. This indicates that Cardaminesp. is extremely efficient in extracting Se from soil and translocating it into its above-ground biomass. Therefore, Cardamine sp., found in Yutangba Se Mining Field may be a new Se hyperaccumulator. It is still uncertain whether the Se-accumulation or detoxification of Cardamine sp. happens through the pathway of SeCys methylated to form Se-methylselenoCys or through the formation of Se-carboxymethyl-selenohomocysteine. Indeed, further study should be carried out on the determination of more Se species to explain the high Se hyperaccumulation in Cardamine sp.

关键词Enshi se Hyperaccumulator cardamine Sp. se Speciation secys2
收录类别EI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/9315
专题矿床地球化学国家重点实验室
作者单位1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
2.College of Life Science, Guizhou University, Guiyang 550025, China
3.College of Earth Science, University of Chinese Academy of Sciences, Beijing 100049, China
4.South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650 , China
5.Zhejiang Center for Disease Control and Prevention, Hangzhou 310009, China
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Shuxun Shao;Guodong Deng;Xiubo Mi;Shengqiao Long;Jing Zhang;Jun Tang. Accumulation and speciation of selenium in Cardamine sp. in Yutangba Se Mining Field, Enshi, China[J]. Chinese Journal of Geochemistry,2014,33(4):357-364.
APA Shuxun Shao;Guodong Deng;Xiubo Mi;Shengqiao Long;Jing Zhang;Jun Tang.(2014).Accumulation and speciation of selenium in Cardamine sp. in Yutangba Se Mining Field, Enshi, China.Chinese Journal of Geochemistry,33(4),357-364.
MLA Shuxun Shao;Guodong Deng;Xiubo Mi;Shengqiao Long;Jing Zhang;Jun Tang."Accumulation and speciation of selenium in Cardamine sp. in Yutangba Se Mining Field, Enshi, China".Chinese Journal of Geochemistry 33.4(2014):357-364.
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