The aim of the study was to evaluate the cellulolytic activity, mucoid diversity and pathogenicity of selected strains of Clavibacter michiganensis subsp. sepedonicus (Cms) from National Collection of Plant Pathogenic Bacteria (NCPPB), York in United Kingdom in relation to eggplant (Solanum melongena). The disease symptoms on test plants range from 6.1 to 38.4% and two strains had no signs of infection. Hydrolysis zones of carboxymethylcellulose in the plate test resulted in high heterogeneity and ranged from 0.33 to 4.29 mm. High virulence of Cms strains in bioassay was observed with the increase of enzyme activity. The obtained results indicate that the correlation between pathogenicity of selected strains on eggplants and mucoid based on optical density of suspensions was significant at the level of –0.54.

Celem przeprowadzonych badań była ocena właściwości celulolitycznych, zróżnicowania mukoidalnego oraz patogeniczności w stosunku do bakłażana (Solanum melongena) wybranych szczepów Clavibacter michiganensis subsp. sepedonicus (Cms) pochodzących z National Collection of Plant Pathogenic Bacteria (NCPPB), York w Wielkiej Brytanii. Objawy chorobowe na roślinach testowych kształtowały się na poziomie od 6,1 do 38,4%, dla dwóch szczepów nie stwierdzono symptomów porażenia. Strefy hydrolizy karboksymetylocelulozy w teście płytkowym wykazały dużą niejednorodność i wynosiły od 0,33 do 4,29 mm. Wraz ze wzrostem aktywności enzymu obserwowano wzrost wirulencji bakterii Cms w teście biologicznym. Korelacja patogeniczności szczepów określona w teście na bakłażanach i mukoidalności stwierdzonej na podstawie gęstości optycznej zawiesin była istotna i wyniosła –0,54.

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