title: Fractionation of Stable Cadmium Isotopes in the Cadmium Tolerant Ricinus communis and Hyperaccumulator Solanum nigrum.
abstract: Cadmium (Cd) isotopes provide new insights into Cd uptake, transport and storage mechanisms in plants. Therefore, the present study adopted the Cd-tolerant Ricinus communis and Cd-hyperaccumulator Solanum nigrum, which were cultured under controlled conditions in a nutrient solution with variable Cd supply, to test the isotopic fractionation of Cd during plant uptake. The Cd isotope compositions of nutrient solutions and organs of the plants were measured by multiple collector inductively coupled plasma mass spectrometry (MC-ICPMS). The mass balance of Cd isotope yields isotope fractionations between plant and Cd source (δ(114/110)Cdorgans-solution) of -0.70‰ to -0.22‰ in Ricinus communis and -0.51‰ to -0.33‰ in Solanum nigrum. Moreover, Cd isotope fractionation during Cd transport from stem to leaf differs between the Cd-tolerant and -hyperaccumulator species. Based on these results, the processes (diffusion, adsorption, uptake or complexation), which may induce Cd isotope fractionation in plants, have been discussed. Overall, the present study indicates potential applications of Cd isotopes for investigating plant physiology.
authors.affiliation: Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
authors.forename: Rongfei
authors.initials: R
authors.lastname: Wei
authors.affiliation: Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
authors.forename: Qingjun
authors.initials: Q
authors.lastname: Guo
authors.affiliation: Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China.
authors.forename: Hanjie
authors.initials: H
authors.lastname: Wen
authors.affiliation: Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China.
authors.forename: Congqiang
authors.initials: C
authors.lastname: Liu
authors.affiliation: Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
authors.forename: Junxing
authors.initials: J
authors.lastname: Yang
authors.affiliation: Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
authors.forename: Marc
authors.initials: M
authors.lastname: Peters
authors.affiliation: Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Hu
authors.affiliation: Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China.
authors.forename: Guangxu
authors.initials: G
authors.lastname: Zhu
authors.affiliation: Shenyang Academy of Environmental Science, Shenyang 110016, China.
authors.forename: Hanzhi
authors.initials: H
authors.lastname: Zhang
authors.affiliation: Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
authors.forename: Liyan
authors.initials: L
authors.lastname: Tian
authors.affiliation: Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
authors.forename: Xiaokun
authors.initials: X
authors.lastname: Han
authors.affiliation: Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Ma
authors.affiliation: Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China.
authors.forename: Chuanwei
authors.initials: C
authors.lastname: Zhu
authors.affiliation: College of Applied Arts and Science of Beijing Union University, Beijing 100191, China.
authors.forename: Yingxin
authors.initials: Y
authors.lastname: Wan
mesh_terms: D002104:Cadmium / Q000032:analysis*; D007554:Isotopes / Q000032:analysis*; D013058:Mass Spectrometry; D012278:Ricinus / Q000737:chemistry* / Q000254:growth & development; D032324:Solanum nigrum / Q000737:chemistry* / Q000254:growth & development
chemical_list: D007554:Isotopes; D002104:Cadmium