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Imaging translocation and transformation of bioavailable selenium by Stanleya pinnata with X-ray microscopy

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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.

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Acknowledgments

This research was supported by California State University East Bay (CSUEB), a CSUPERB Faculty Seed Grant, and a Faculty Support Grant to D.L.L and a CSUEB Graduate Research Grant and Fellowship awarded to W.M.A. We especially thank Elizabeth Pilon-Smits of Colorado State University for seeds and Qilin Chan and Joseph Caruso for GC-ICP-MS analysis. We would also like to thank Leanne Thompson, Jennifer Cassano, Gina Anderson, Lisa Xu, Sandra Carrasco-Gil, Cynthia Patty, Florian Meirer, Jie Chen, and Renee N. Easter. Portions of this research were done at the SSRL, a Directorate of SLAC National Accelerator Laboratory and an Office of Science User Facility operated for the US Department of Energy Office of Science by Stanford University. The SSRL Structural Molecular Biology Program is supported by the DOE Office of Biological and Environmental Research, and by the National Institutes of Health, National Center for Research Resources, Biomedical Technology Program (P41RR001209).

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Authors and Affiliations

  1. Department of Chemistry & Biochemistry, California State University East Bay, Hayward, CA, 94542, USA

    Wren Amos, Joy C. Andrews & Danika L. LeDuc

  2. Stanford Linear Accelerator Center, Menlo Park, CA, 94025, USA

    Samuel Webb, Yijin Liu & Joy C. Andrews

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  1. Wren Amos
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  2. Samuel Webb
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  3. Yijin Liu
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  4. Joy C. Andrews
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  5. Danika L. LeDuc
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Correspondence to Joy C. Andrews.

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Published in the special paper collection Imaging Techniques with Synchrotron Radiation with guest editor Cyril Petibois.

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Amos, W., Webb, S., Liu, Y. et al. Imaging translocation and transformation of bioavailable selenium by Stanleya pinnata with X-ray microscopy. Anal Bioanal Chem 404, 1277–1285 (2012). https://doi.org/10.1007/s00216-012-5881-2

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  • DOI: https://doi.org/10.1007/s00216-012-5881-2

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