Abstract
The purpose of this study was to survey the growth inhibition with volatile antibiosis and killing of Pythium irregulare by Trichoderma species of various origin under heavy metal stress. Fourteen strains of T. harzianum, 10 strains of T. virens, and 14 strains of T. viride were tested in dual culture with the pathogen on heavy metal poisoned media. Minimum inhibitory concentrations (MIC) for mycelial growth, antibiosis and Pythium-killing were determined. Although the decreasing order of toxicity (Cd≯Ni≯Zn) was the same for the growth of Pythium and the antagonists, the pathogen tolerated 2-4 times higher doses of toxic metals than Trichoderma strains did. The antagonistic activities proved to be more sensitive, they were blocked by 0.16-0.67 mM Cd, 0.16-1.25 Ni or Zn. Pythium-killing was observed at higher doses of Ni than that of Cd or Zn, which were similar toxic to the both investigated activities. The history of long-term heavy metal exposure of some investigated Trichoderma strains did not increase...
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