Abstract
Nearly complete sequences of 16S rRNA genes of representative strains of the genus Saccharomonospora were determined following the isolation and cloning of the amplified genes. The sequences were aligned with those of representatives of the family Pseudonocardiaceae, and a phylogenetic tree was inferred by the neighbor-joining method. The genus Saccharomonospora formed a distinct clade within the evolutionary radiation encompassed by the family Pseudonocardiaceae. The average nucleotide similarity value found between the type strains of the four validly described Saccharomonospora species was 97.5% +/- 1.0%. The most distant relationship was found between Saccharomonospora azurea and Saccharomonospora viridis K73 (96.3% similarity). In contrast, Saccharomonospora azurea K161 and "Saccharomonospora caesia" K163 had identical 16S rRNA gene sequences. The nucleotide sequence data suggest that the genus Saccharomonospora contains several new centers of variation.
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