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Uptake, Metabolism, and Volatilization of Selenium by Terrestrial Plants

  • Elizabeth A. H. Pilon-Smits
  • Gary S. Bañuelos
  • David R. ParkerEmail author
Chapter
Part of the Global Issues in Water Policy book series (GLOB, volume 5)

Abstract

There is a broad range in the tendency for higher plants to take up and accumulate Se in their aerial parts, both across species and within species. The primary accumulators of Se (hyperaccumulators) are from the Brassicaceae, Fabaceae and Asteraceae families, are endemic to naturally seleniferous soils, and can exhibit shoot Se concentrations as high as 10 × 103 mg kg−1 dry weight in field-grown specimens. Typically inorganic selenate is transported to the leaf chloroplast, where it is reduced first to selenite and then further reduced and assimilated into organic Se. Because of the chemical similarities between Se and S, selenate and selenite are readily assimilated by the S-metabolizing enzymes of the plant. The first stable, organic form of Se produced is selenocysteine which can be incorporated nonspecifically into proteins in lieu of cysteine, leading to phytotoxicity. An alternative fate of selenocysteine is ultimate conversion to selenomethionine, which also can be incorporated mistakenly into proteins, with generally less harmful effects. The selenomethionine can also be volatilized, converted to volatile dimethylselenide, offering a release valve for excess Se from the plant. Phytovolatilization of methylated Se compounds, offers an opportunity for the phytoextraction strategies to mitigate selenium laden soils.

Keywords

Tall Fescue Sulfate Transporter Dimethyl Selenide Double Transgenics Seleniferous Soil 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • Elizabeth A. H. Pilon-Smits
    • 1
  • Gary S. Bañuelos
    • 2
  • David R. Parker
    • 3
    Email author
  1. 1.Department of BiologyColorado State UniversityFort CollinsUSA
  2. 2.Water Management Research UnitUnited States Department of Agriculture, Agricultural Research ServiceParlierUSA
  3. 3.Department of Environmental SciencesUniversity of CaliforniaRiversideUSA

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