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Keywords:

  • Ectomycorrhizal fungi;
  • toxic metals;
  • interactions;
  • metal tolerance

summary

A number of ectomycorrhizal (ECM) fungi, from sites uncontaminated by toxic metals, were investigated to determine their sensitivity to Cd2+, Pb+2, Zn2+ and Sb3−, measured as an inhibition of fungal biomass production, Isolates were grown in liquid media amended with the metals, Individually (over a range of concentrations) and in combination (at single concentrations) to determine any significant interactions between the metals. Significant interspecific variation in sensitivity to Cd2+ and Zn2+ was recorded, while Pb2+ and Sb3− individually had little effect. The presence of Pb2+ and Sb3− in the media did however, amcliorate Cd2+ and Zn2+ toxicity in some circumstances. Interactions between Cd+2 and Zn+2 were investigated further over a range of concentrations. Zn2+ was found to significantly ameliorate the toxicity of Cd2+ to three of the four isolates tested. The influence of Zn2+varied between ECM species and with the concentrations of metals tested.