Phylogenetic analysis of the genera Pseudonocardia and Actinobispora basedon 16S ribosomal DNA sequences

The 16S rDNA sequences of 11 strains, nine type strains of validated Pseudo nocardia species and Actinobispora yunnanensis, and two strains of unnamed Pseudonocardia species, were determined and compared with those of represen tatives of the family Pseudonocardiaceae. The phylogenetic analysis indicat ed that all of the validated species of the genera Pseudonocardia and Actin obispora consistently formed a monophyletic unit and separated well from th e other genera of the family Pseudonocardiaceae. One unnamed Pseudonocardia strain was related to members of the genus Pseudonocardia, whereas the oth er unnamed Pseudonocardia strain formed a distinct clade within the radiati on of the genus Amycolatopsis. (C) 2000 Federation of European Microbiologi cal Societies. Published by Elsevier Science B.V. All rights reserved.