%0 Journal Article %A Rainey, Frederick A. %A Burghardt, Jutta %A Kroppenstedt, Reiner M. %A Klatte, Stefan %A Stackebrandt, Erko %T Phylogenetic analysis of the genera Rbodococcus and Nocardia and evidence for the evolutionary origin of the genus Nocardia from within the radiation of Rbodococcus species %D 1995 %J Microbiology, %V 141 %N 2 %P 523-528 %@ 1465-2080 %R https://doi.org/10.1099/13500872-141-2-523 %K R bodococcus %K Nocardia %K phylogeny %K 16S rDNA sequences %K CMN group of Actinomycetales %I Microbiology Society, %X SUMMARY: 16S rDNA analysis was performed on 32 strains of 26 species of the genera Rbodococcus and Nocardia in order to investigate the phylogenetic structure of these genera within the radiation of other mycolic-acid-containing genera such as Corynebacterium, Dietzia, Gordona, Mycobacterium and Tsukamurella. The genus Rbodococcus shows a complex structure, consisting of six phylogenetically equidistant lineages. The genus Nocardia does not appear to be a sister taxon of Rbodococcus but branches off from within the radiation of Rbodococcus ; thus its species can be considered to be derived from a Rbodococcus ancestor. The main known phenotypic feature that separates Nocardia species from those of Rbodococcus appears to be the presence of a cyclic component in menaquinone of the MK-8(H 4 ) type. %U https://www.microbiologyresearch.org/content/journal/micro/10.1099/13500872-141-2-523