Predicting molybdenum toxicity to higher plants: Estimation of toxicity threshold values

S. P. McGrath, C. Micó, F. J. Zhao, J. L. Stroud, H. Zhang, S. Fozard

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

Four plant species (oilseed rape, Brassica napus L.; red clover, Trifolium pratense L.; ryegrass, Lolium perenne L.; and tomato, Lycopersicon esculentum L.) were tested on ten soils varying widely in soil properties to assess molybdenum (Mo) toxicity. A larger range (66-fold-609-fold) of added Mo concentrations resulting in 50% inhibition of yield (ED50) was found among soils than among plant species (2-fold-38-fold), which illustrated that the soils differed widely in the expression of Mo toxicity. Toxicity thresholds based on soil solution Mo narrowed the variation among soils compared to thresholds based on added Mo concentrations. We conclude that plant bioavailability of Mo in soil depends on Mo solubility, but this alone did not decrease the variability in observed toxicity enough to be used in risk assessment and that other soil properties influencing Mo toxicity to plants need to be considered.

Original languageEnglish
Pages (from-to)3095-3102
Number of pages8
JournalEnvironmental Pollution
Volume158
Issue number10
DOIs
Publication statusPrint publication - Oct 2010
Externally publishedYes

Keywords

  • Bioavailability
  • DGT
  • Molybdenum
  • Plant toxicity
  • Risk assessment

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