[Phylogenetic analysis of Nocardiopsis species based on 16S rRNA, gyrB, sod and rpoB gene sequences].

In order to understand the phylogenetic relationships among Nocardiopsis species more rationally, the gyrB, sod and rpoB gene partial sequences of 24 validly published Nocardiopsis species were determined. The phylogenetic trees were reconstructed including 16S rRNA gene and above-mentioned three housekeeping genes. The average similarities of gyrB, sod and rpoB of Nocardiopsis species were 87.7%, 87.3% and 94.1%, respectively. Meanwhile, the average similarity of 16S rRNA gene of Nocardiopsis species was 96.65%. The variabilities of gyrB, sod and rpoB gene in Nocardiospis are greater than that of 16S rRNA gene. By comparing the phylogenetic trees, the topology of gyrB gene tree is almost consistent with that of 16S rRNA gene tree. Consequently, the gyrB gene possesses the superiority in phylogenetic taxonomy of the genus Nocardiopsis.