1887

Abstract

A former subgenus of the genus ,” comprises a wide range of species, including the so-called “atypical streptobacteria,” which includes the group. Various identification systems and differentiation criteria for and have been described previously and are well established. The phenotypic diversity within these two species was the reason for comparing phenotypic variations with DNA homology data. Previously described biotypes of (Katagiri, Kitahara, and Fukami) and (Abo-Elnaga and Kandler) were the basis for selecting strains. Strains of all known biotypes of these species were examined to determine their biochemical reactions, their physiological growth characteristics, their total soluble protein contents as determined by a pattern analysis in which native polyacrylamide gel electrophoresis and sodium dodecyl sulfate-polyacrylamide gel electrophoresis with colloidal Coomassie blue and silver diamine stainine were used, and their levels of DNA homology as determined by DNA-DNA hybridization experiments. All of the phenotypic analyses revealed a diversity within the taxa, whereas the DNA-DNA hybridization analysis revealed that the level of genomic homogeneity within each species was relatively high. The phenotypic diversity and genomic homogeneity which we observed allowed us to describe subgroups of and . The descriptions of and are emended accordingly. These subgroups which we describe may be the basis for defining subspecies within these two species.

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1996-04-01
2022-05-25
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