Bioactive substances of agaricoid basidiomycetes and their possible role in regulation of myco- and microbiota structure in soils of forest ecosystems - II. Antibiotic activity in cultures of litter saprotrophic mushroom Lepista nuda [Russian]

摘要

The litter saprotroph Lepista nuda had the most common type of the action on micro- and mycobiota inhabiting the forest soils and litter. 98 isolates from different colony types (total 60 colonies) of L. nuda were tested for the production of active metabolites in agar medium and its intraspecific variability. It was observed the stable capacity to produce antibiotics in natural populations of L. nuda, only cultures of 3 isolates had not antimicrobial activity. Biological active metabolites of L. nuda inhibited growth of the most bacteria isolated only from soils outside of their colonies, while bacteria developing in the area of active growing mycelia of this species were completely resistant. The same phenomena were observed in tests with some actinomycetes and micromycetes. Cell-free cultural filtrates of L. nuda isolate 146-2 caused complete or partial inhibition of spore germination in a range of soil micromycetes species, but this action was fungistatic. Widespread occurence of capacity to a biosynthesis of the biological active metabolites in populations of L. nuda and their selecting action on soil micromycetes and bacteria suggest an important role of antibiotics of this species in the regulation of the structural composition of micro- and mycobiota in forest soils and litter.