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Large restriction fragment (macrorestriction) patterns resolved by pulsed-field gel electrophoresis (PFGE) were used to calculate the genomic similarity within and among five members of the genus Chromatium with closely related phenotypes: C. minutissimum, C. vinosum, C. gracile, C. salexigens, and C. tepidum. PFGE allowed the study of the genomic organizations of these organisms. The results reveal a high level of homogeneity among the strains of C. vinosum analyzed. Moreover, there seems to be a close genetic relationship between C. vinosum and C. minutissimum. Chromatiaceae are anaerobic phototrophic organisms able to grow with sulfide or elemental sulfur as the sole photosyn- thetic electron donor. The arrangement of genera and species of the family Chromatiaceae is entirely based on simple phe- notypic characteristics (13). Phylogenetic relationships show- ing that this family constitutes a phylogenetically coherent group, with S,, values of more than 0.66, have been estab- lished (3). The type genus of the family, the genus Chromatium, is distinguished from other motile genera of purple sulfur bacte- ria with intracellular sulfur globules by its rod-shaped mor- phology and the lack of gas vesicles. The DNA ratios of the genus (G+C content, 45.5 to 70.4 mol%) indicate that genet- ically distantly related species are grouped together. This idea has been corroborated by 16s rRNA analysis, which shows that the species of Chromatium analyzed do not form a coherent genus (3).

international journal of systematic bacteriology

Genomic Relationship of Five Species of the Genus Chromatium by Analysis of Large Restriction Fragments (Macrorestriction Analysis) Using Pulsed-Field Gel Electrophoresis