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Differentiation between xanthomonas campestris pathovar oryzae xanthomonas campestris pathovar oryzicola and the bacterial brown blotch pathogen on rice by numerical analysis of phenotypic features and protein gel electrophoregrams



Differentiation between xanthomonas campestris pathovar oryzae xanthomonas campestris pathovar oryzicola and the bacterial brown blotch pathogen on rice by numerical analysis of phenotypic features and protein gel electrophoregrams



Journal of General Microbiology 130(11): 2983-3000



Thirty-five X. campestris pathovar (pv) oryzae, 14 X. campestris pv. oryzicola strains and 6 brown blotch pathogens of rice, all of different geographical origin, were studied by numerical analysis of 133 phenotypic features and gel electrophoregrams of soluble proteins, %G + C determinations and DNA:rRNA hybridizations. X. campestris pv. oryzae and pv. oryzicola display clearly distinct protein patterns on polyacrylamide gels and can be differentiated from each other by 4 phenotypic tests. Both pathovars are indeed members of Xanthomonas which belongs to a separate rRNA branch of the 2nd rRNA superfamily together with the rRNA branches of Pseudomonas fluorescens, Marinomonas, Azotobacter, Azomonas and Frateuria. Brown blotch strains are considerably different from X. campestris pv. oryzae and pv. oryzicola. They are not members of the genus Xanthomonas, but are more related to the generically misnamed Flavobacterium capsulatum, P. paucimobilis, Flavobacterium devorans and P. azotocolligans belonging in the 4th rRNA suprefamily. No collelation was found between the virulence, pathogenic groups or geographical distribution of X. campestris pv. oryzae or pv. oryzicola strains and any phenotypic or protein electrophoretic property of clustering.

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