Abstract
This study aimed to clarify the taxonomic relationships among Streptomyces costaricanus, Streptomyces graminearus, Streptomyces murinus and Streptomyces phaeogriseichromatogenes. These strains share the same 16S rRNA gene sequence. Multilocus sequence analysis revealed that S. costaricanus, S. murinus and S. phaeogriseichromatogenes belong to the same species, but S. graminearus does not. Digital DNA-DNA relatedness and average nucleotide identity among S. costaricanus, S. murinus and S. phaeogriseichromatogenes were 70.9-74.6% and 96.5-97.0 %, respectively. In addition to the previously reported phenotypic data, the presence of a similar set of secondary metabolite-biosynthetic gene clusters for polyketides and nonribosomal peptides supported the similarity among the three species. Therefore, S. costaricanus and S. phaeogriseichromatogenes should be reclassified as later heterotypic synonyms of S. murinus.
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