Biological Systems: Theory and Innovation

Under the action of pesticides, the frequency of occurrence of morphologically different forms in phytopathogenic bacteria of the species Pseudomonas syringae increases, which leads to complications in the isolation of pathogens and their identification by phenotype. The aim of the work was to study the biological properties of S- and R-forms of the causative agent of basal wheat bacteriosis P. syringae pv. atrofaciens. It was established that R-disociants of P. syringae pv. atrofaciens UKM B-1011 and P. syringae pv. atrofaciens 9780 in physiological and biochemical proper es did not differ from each other and from the ini al S-form of these strains. R-forms of P. syringae pv. atrofaciens UKM B-1011 and P. syringae pv. atrofaciens 9780 better forms a biofilm compared to the S-form of these strains, provides them with a competive advantage in the forma on of populations in the philosphere. It was shown that the R-forms do not lose the virulent properties inherent in the original S-form of P. syringae pv. atrofaciens. An increase in the population of P. syringae pv. atrofaciens the number of individuals characterized by an increased ability to form biofilms while maintaining virulent properties, may increase the risk of epiphytoties caused by this pathogen

phytopathogenic bacteria; P. syringae pv. atrofaciens; morphological disociants; biofilms; virulence