RESEARCH ON THE ROLE OF MICROBIAL CONSORTIUM IN BIOSYNTHESIS OF HUMIC PRECURSORS BASED ON SECONDARY EXOMETABOLITES
The ability of exometabolites formation by secondary metabolism of edaphic
microorganisms is genetically determined and antibiotic properties and their biologically activity accompanies this skill, also. Microbial isolates from different soil types and vermicompost were selected based on their ability to excrete soluble secondary metabolites in growth medium, and identified as belonging to the genera Bacillus, Pseudomonas, Lactobacillus, Streptomyces, Fusarium, Aspergillus and Botrytis. The qualitative and quantitative influence of the number of microbial isolates or the type of microbial consortia on the content of secondary exometabolites with a composition close to humic acids precursors has been assessed by circular chromatography analysis, enzymes activities and polysaccharide biosynthesis.