The aim of the experiment was to analyse bacterial strains of Arthrobacter ssp. isolated from rhizosphere, rhizoplane and endorhizoplane of winter rye. The enzymatic and antagonistic activities against phytopathogenic fungi were studied. A high activity of isolated strains in protein, starch, pectins, lecithin hydrolysis was observed. Numerous strains showed a potential for benefiting from organic rather than mineral sources of phosphorus. All the strains examined were catalase positive. Mycoantagonism of Arthrobacter ssp. bacteria was investigated towards Fusarium genus fungi. The results obtained from microbiological and statistical analyses show that very antagonistic strains of Arthrobacter genus bacteria occur in the soil rhizosphere. The correlation analysis shows that protein hydrolysis can be involved in antagonistic mechanisms, and that pectinolytic strains are less effective in growth inhibition of pathogenic fungi.

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