Ribosomal ribonucleic acid cistron homologies among Hyphomicrobium and various other bacteria

Abstract

The extent of hybrid formation between the rRNA of Hyphomicrobium strain B-522 and DNA from bacteria of 21 different genera was examined. Three generalized groupings were formed. Group 1 (72-100%) consisted entirely of other strains of Hyphomicrobium. Representatives of the genera Rhodopseudomonas, Chromatium, Caulobacter, Prosthecomicrobium, Rhodomicrobium, Hyphomonas and Hyphomicrobium made up group II (49-69%). The remaining gram-negative, gram-positive and cell wall-less bacteria fell into group III (12-40%). The taxonomic implications of these results are discussed.