Abstract
By using of ultrafiltration procedure water-soluble peptide metabolites were isolated from the culture filtrates of several fungal strains including Bipolaris sorokiniana IB G-12, Fusarium oxysporum VKM F-137, Rhizoctonia solani VKM F-895 and Trichoderma harzianum IB G-58. Fractions of low molecular weight metabolites (Mw≥1 kDa) from all fungal strains were characterized with similar values of relative mobility (Rf ~ 0.37-0.39). Only extracellular metabolites of F. oxysporum and B. sorokiniana demonstrated bactericidal activity in agar-diffusion tests. Under tests of submerged liquid cultures, fungal metabolites selectively inhibited the growth of PGPR bacteria; the strain of Paenibacillus ehimensis IB-739 was most sensitive to their action. At the same time, fungal metabolites stimulated the growth of the B. subtilis IB-54 and nonspecific increase of its fungicidal activity, while enhancement in antifungal effect of the P. ehimensis IB-739 was species-specific. Most fungal metabolites suppressed under concentrations ≥ 0.25-0.5 mg/ml the development of fouling biofilms only in Bacillus strains that were characterized with high biofilm-forming ability in vitro. The synthesis of chitinolytic enzymes by the P ehimensis IB-739 strain was induced in presence of aqueous extracts from the some of micromycetes’ mycelia but not their extracellular metabolites.
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