title: Imaging translocation and transformation of bioavailable selenium by Stanleya pinnata with X-ray microscopy.
abstract: Selenium hyperaccumulator Stanleya pinnata, Colorado ecotype, was supplied with water-soluble and biologically available selenate or selenite. Selenium distribution and tissue speciation were established using X-ray microscopy (micro-X-ray fluorescence and transmission X-ray microscopy) in two dimensions and three dimensions. The results indicate that S. pinnata tolerates, accumulates, and volatilizes significant concentrations of selenium when the inorganic form supplied is selenite and may possess novel metabolic capacity to differentiate, metabolize, and detoxify selenite concentrations surpassing field concentrations. The results also indicate that S. pinnata is a feasible candidate to detoxify selenium-polluted soil sites, especially locations with topsoil polluted with soluble and biologically available selenite.
authors.affiliation: Department of Chemistry & Biochemistry, California State University East Bay, Hayward, CA 94542, USA.
authors.forename: Wren
authors.initials: W
authors.lastname: Amos
authors.forename: Samuel
authors.initials: S
authors.lastname: Webb
authors.forename: Yijin
authors.initials: Y
authors.lastname: Liu
authors.forename: Joy C
authors.initials: JC
authors.lastname: Andrews
authors.forename: Danika L
authors.initials: DL
authors.lastname: LeDuc
mesh_terms: D001673:Biodegradation, Environmental; D019607:Brassicaceae / Q000378:metabolism* / Q000648:ultrastructure; D005453:Fluorescence; D008853:Microscopy / Q000379:methods; D018517:Plant Roots / Q000378:metabolism / Q000648:ultrastructure; D064586:Selenic Acid; D012643:Selenium / Q000032:analysis* / Q000378:metabolism*; D018036:Selenium Compounds / Q000378:metabolism; D017356:Synchrotrons; D014965:X-Rays
chemical_list: D018036:Selenium Compounds; D012643:Selenium; D064586:Selenic Acid