Genomic relationship of five species of the genus Chromatium by analysis of large restriction fragments (macrorestriction analysis) using pulsed- field gel electrophoresis

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.