We performed a numerical analysis of the results of biochemical and nutritional tests done with strains of nonfluorescent plant-pathogenic spp. A total of 57 tests were used, and determinative tests which discriminated between taxa were identified. , and were distinguished as distinct members of the genus . Strains of and formed a single cluster having affinities with . Strains of were allocated to spp. Strains of subsp. subsp. , and formed a single relatively homogeneous cluster, within which three subclusters were discerned. Strains presently identified as and as , including the type strain of , formed a single homogeneous subcluster. Strains of subsp. and subsp. formed two subclusters. Genomic probes prepared from DNAs of the type strains of subsp. subsp. , and gave positive reactions with all of the strains of these species which were tested in colony hybridization studies, but not with strains of other nonfluorescent spp. The G+C ratios of these type strains were all in the range from 67 to 71 mol%, and the levels of homology determined in DNA-DNA reassociation studies were all greater than 70%. subsp. subsp. , and are considered to be members of a single species, , with and as junior synonyms; subsp. and subsp. are proposed as subspecies.


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