Influence of temperature and oil pollution on interactions of soil micromycetes and PGPR strain

PGP bacteria are used as biological products in crop production. Native soil micromycetes can have a negative effect, reducing the effectiveness of biopreparations. To clarify the possibilities of these phenomena and the influence of environmental temperature and the presence of a pollutant (oil) on them, an experiment was conducted in which Azospirillum brasilense SR80 (IBPPM24) was used as a bacterial strain, 5 strains of various micromycetes were used as fungi: Fusarium oxysporum IBPPM543, Lecanicillium aphanocladii IBPPM542, Talaromyces sayulitensis IBPPM664, Trichoderma viride IBPPM668, and Trichoderma harzianum IBPPM667. The microorganisms under study had different optimum growth temperatures, as well as oil-oxidizing potential, which affected the character of their interactions. The fungi T. sayulitensis IBPPM664 and T. viride IBPPM668 exhibited pronounced antagonism towards the PGPR strain. The bacterium A. brasilense SR80 inhibited the growth of the phytopathogenic fungus F. oxysporum IBPPM543. The presence of oil, to a lesser extent, but impacted on culture growth and bacterial-fungal relationships.