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Sulfur–selenium–molybdenum interactions distinguish selenium hyperaccumulator Stanleya pinnata from non-hyperaccumulator Brassica juncea (Brassicaceae)

Planta volume 239, pages 479–491 (2014)Cite this article

Abstract

Long-term sulfate, selenate and molybdate accumulation and translocation were investigated in two ecotypes of Stanleya pinnata and non-hyperaccumulator Brassica juncea under different levels of applied sulfate and selenate. Morphological differences were observed between the ecotypes of S. pinnata, but few differences in selenium (Se) and sulfur (S) accumulation were measured. Se-to-S ratios were nearly identical between the ecotypes under all treatments. When compared with B. juncea, several unique trends were observed in the hyperaccumulators. While both S. pinnata ecotypes showed no significant effect on Se content of young leaves when the supplied sulfate in the growth medium was increased tenfold (from 0.5 to 5 mM), the Se levels in B. juncea decreased 4- to 12-fold with increased sulfate in the growth medium. Furthermore, S. pinnata’s S levels decreased slightly with high levels of supplied Se, suggesting competitive inhibition of uptake, while B. juncea showed higher S levels with increasing Se, possibly due to up-regulation of sulfate transporters. Both ecotypes of S. pinnata showed much larger Se concentrations in young leaves, while B. juncea showed slightly higher levels of Se in older leaves relative to young. Molybdenum (Mo) levels significantly decreased in S. pinnata with increasing sulfate and selenate in the medium; B. juncea did not show the same trends. These findings support the hypothesis that S. pinnata contains a modified sulfate transporter with a higher specificity for selenate.

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Acknowledgments

Funding for these studies was provided by National Science Foundation grant # IOS-0,817,748 to Elizabeth A. H. Pilon-Smits and a Colorado State University graduate Plant Molecular Biology Program fellowship to Jonathan Harris.

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  1. Biology Department, Colorado State University, Fort Collins, CO, 80523, USA

    Jonathan Harris, Kathryn A. Schneberg & Elizabeth A. H. Pilon-Smits

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  1. Jonathan Harris
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  2. Kathryn A. Schneberg
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  3. Elizabeth A. H. Pilon-Smits
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Correspondence to Elizabeth A. H. Pilon-Smits.

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Harris, J., Schneberg, K.A. & Pilon-Smits, E.A.H. Sulfur–selenium–molybdenum interactions distinguish selenium hyperaccumulator Stanleya pinnata from non-hyperaccumulator Brassica juncea (Brassicaceae). Planta 239, 479–491 (2014). https://doi.org/10.1007/s00425-013-1996-8

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  • DOI: https://doi.org/10.1007/s00425-013-1996-8

Keywords

  • Selenium specificity
  • Phytoremediation
  • Biofortification
  • Indian mustard
  • Prince’s plume