title: Interaction between U and Th on their uptake, distribution, and toxicity in V S. alfredii based on the phytoremediation of U and Th.
abstract: Variant Sedum alfredii Hance (V S. alfredii) could simultaneously take up U and Th from water with the highest concentrations recorded as 1.84 × 104and 6.72 × 103mg/kg in the roots, respectively. Th stimulated U uptake by V S. alfredii roots at Th10(10 μM of Th), however, the opposite was observed at Th100(100 μM of Th). A similar result was found in the effect of U on the uptake of Th by V S. alfredii. Subcellular fractionation studies of V S. alfredii indicated that U and Th were mainly stored in cell wall fraction, and much less was found in organelle and soluble fractions. Chemical form examination results showed that water-soluble U and Th were the predominant chemical forms in this plant. Addition of the other radionuclide in aqueous solutions altered the concentration and percentage of U or Th in cell wall fraction and in water-soluble form, resulting in the change of the uptake capacity of U or Th by V S. alfredii roots. Comparing with single U or Th treatment, the plant cells revealed more swollen chloroplasts and enhanced thickening in cell walls under the U100+ Th100treatment, as observed by TEM. Those results collectively displayed that V S. alfredii may be utilized as a potential plant to simultaneously remove U and Th from aqueous solutions (rhizofiltration).
authors.affiliation: College of Chemistry, Sichuan University, Chengdu, 610064, China.
authors.forename: Zhenling
authors.initials: Z
authors.lastname: Huang
authors.affiliation: College of Chemistry, Sichuan University, Chengdu, 610064, China.
authors.forename: Siqun
authors.initials: S
authors.lastname: Tang
authors.affiliation: College of Chemistry, Sichuan University, Chengdu, 610064, China.
authors.forename: Lu
authors.initials: L
authors.lastname: Zhang
authors.affiliation: College of Chemistry, Sichuan University, Chengdu, 610064, China.
authors.forename: Lijian
authors.initials: L
authors.lastname: Ma
authors.affiliation: College of Chemistry, Sichuan University, Chengdu, 610064, China.
authors.forename: Songdong
authors.initials: S
authors.lastname: Ding
authors.affiliation: Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, 621900, China.
authors.forename: Liang
authors.initials: L
authors.lastname: Du
authors.affiliation: Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, 621900, China.
authors.forename: Dong
authors.initials: D
authors.lastname: Zhang
authors.affiliation: College of Chemistry, Sichuan University, Chengdu, 610064, China.
authors.forename: Yongdong
authors.initials: Y
authors.lastname: Jin
authors.affiliation: Institute of Chinese Medical Sciences, University of Macau, Taipa, Macau, China. rwang@umac.mo.
authors.forename: Ruibing
authors.initials: R
authors.lastname: Wang
authors.affiliation: College of Chemistry, Sichuan University, Chengdu, 610064, China. 495140631@qq.com.
authors.forename: Chao
authors.initials: C
authors.lastname: Huang
authors.affiliation: College of Chemistry, Sichuan University, Chengdu, 610064, China. xiachqin@163.com.
authors.forename: Chuanqin
authors.initials: C
authors.lastname: Xia
mesh_terms: D001673:Biodegradation, Environmental; D004785:Environmental Pollutants; D018517:Plant Roots / Q000737:chemistry; D031963:Sedum; D013910:Thorium; D014501:Uranium
chemical_list: D004785:Environmental Pollutants; D014501:Uranium; D013910:Thorium
keywords: Chemical forms; Interaction; Phytoremediation; Subcellular distribution; Thorium; Uranium; V S. alfredii