Biomics

The mechanisms of growth-promoting activity of direct and implicit action displayed by 14 strains of bacteria belonging to genera Advenella, Bacillus, Pseudomonas have been studied. All the studied strains exhibited phosphate-mobilizing activity; six ones were capable to produce auxins (283 - 790 ng/ml). Some bacterial cultures revealed additionally nitrogenase activity, antagonism against phytopathogenic fungi, production of extracellular chitinases and cellulases. The strain B. subtilis IB-54 demonstrated most strong antagonistic effect among the bacteria displaying nitrogenase and cellulolytic activity, while the strain A. kashmirensis IB-K1 was characterized with significant phosphate-mobilizing ability. As well as the cultures belonging to genus Bacillus and A. kashmirensis IB-K1 were moderate halophiles (up to 7% NaCl), whereas the Pseudomonas strains were resistant to a salt concentration of 4-5%. The Bacillus strains suppressed in co-cultures the growth of most bacteria belonging to other genera; however, these not displayed antagonism against each other. Only alone strain P. extremaustralis IB-K13-1A was capable to simultaneous growth together with all studied bacterial cultures. Main findings permit to consider the strains A. kashmirensis IB-K1, P. extremaustralis IB-K13-1A, P. mandelii IBKi-14, B. atrophaeus IB-21, B. subtilis IB-22 and B. subtilis IB-54 displaying PGPR-abilities as promising base of novel multifunctional biopreparations for horticulture.

Advenella, Bacillus, Pseudomonas, phytohormones, phosphate mobilization, antagonism, chitinase, cellulose

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