[Growth stimulating, fungicidal and nematicidal properties of new microbial substances and their impact on si/miRNA synthesis in plant cells].

New substances on the basis of soil streptomycete Streptomyces avermitilis metabolites and also compositions of preparation averkom with elicitors show growth regulating activity and bioprotective properties, proved in experiments with wheat spring of variety Grizo and cucumbers of variety Nezhinskiy. Most of the created substances possess the antagonistic action in relation to phytopathogenic fungi, as well as antinematode activity in relation to the gallic nematode Meleodoidyne incognita. In the conditions of the artificial nematode infecting the preparation averkom and its modifications demonstrate protective action (up to 85-100 %) on cucumber sprouts of Nezhinskiy variety.

[Effect of pyruvate and valine on avermectin biosynthesis by Streptomyces avermitilis UCM Ac-2179].

Pyruvate and valine have been studied for their effect on avermectin biosynthesis by the mutant strain Streptomyces avermitilis UCM Ac-2179. Valine in concentrations 0.5, 1.

[Increasing biosynthesis of avermectins of Streptomyces avermitilis UCM Ac 2161 under the effect N-methyl-N'-nitro-N-nitrosoguanidine].

It had been shown that Streptomyces avermitilis UCM Ac 2161 is a potential source of variants with the raised biosynthetical activity under NG-mutagenesis. Selection was carried out under the level of 0.01-0.