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Rhodococcus kroppenstedtii sp. nov., a novel actinobacterium isolated from a cold desert of the Himalayas, India

¹ Microbial Type Culture Collection and Gene Bank (MTCC), Institute of Microbial Technology, Chandigarh 160 036, India
² Department of Microbiology, Guru Nanak Dev University (GNDU), Amritsar 143 005, India

Correspondence
S. Mayilraj
mayil{at}imtech.res.in

The taxonomic position of an actinomycete, strain K07-23^T, isolated from a cold desert of the Himalayas, India, was established by a polyphasic approach. The strain exhibited phenotypic characters that were typical of the genus Rhodococcus. 16S rRNA gene sequence (1467 bases) comparisons confirmed that strain K07-23^T belongs to the genus Rhodococcus. 16S rRNA sequence similarity studies showed that the isolate is very closely related to Nocardia corynebacterioides DSM 20151^T (98.6 %), which has been recently reclassified as Rhodococcus corynebacterioides. It showed 94.4–96.6 % sequence similarity with other species of the genus Rhodococcus. However, genomic relatedness between strain K07-23^T and R. corynebacterioides as revealed by DNA–DNA hybridization was low (62 %). Based on polyphasic analysis, strain K07-23^T could be clearly distinguished from other species. It is proposed that strain K07-23^T (=MTCC 6634^T=DSM 44908^T=JCM 13011^T) represents a novel species of Rhodococcus, Rhodococcus kroppenstedtii sp. nov.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of Rhodococcus kroppenstedtii strain K07-23^T is AY726605.

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