Roseovarius pelagicus sp. nov., a facultatively anaerobic bacterium with potential for degrading polypropylene, isolated from Arctic seawater

A Gram-stain-negative, facultatively anaerobic, non-motile, rod-shaped bacterial strain, designated HL-MP18 , was isolated from Arctic seawater after a prolonged incubation employing polypropylene as the sole carbon source. Phylogenetic analyses of the 16S rRNA gene sequence revealed that strain HL-MP18 was affiliated to the genus with close relatives LXJ103 (96.8 %) and KCTC 32327 (96.5 %). The complete genome sequence of strain HL-MP18 comprised a circular chromosome of 3.86 Mbp and two circular plasmids of 0.17 and 0.24 Mbp. Genomic comparisons based on average nucleotide identity and digital DNA-DNA hybridization showed that strain HL-MP18 was consistently discriminated from its closely related taxa in the genus . Strain HL-MP18 showed optimal growth at 25 °C, pH 7.0 and 2.5 % (w/v) sea salts. The major cellular fatty acids were C 6 and/or C 7 (49.6 %), C cyclo 8 (13.5 %), and C (12.8 %). The major respiratory quinone was ubiquinone-10. The polar lipids consisted of phosphatidylcholine, phosphatidylglycerol, an unidentified aminolipid and three unidentified lipids. The genomic DNA G+C content of the strain was 59.2 mol%. The phylogenetic, genomic, phenotypic and chemotaxonomic results indicate that strain HL-MP18 is distinguishable from the recognized species of the genus . Therefore, we propose that strain HL-MP18 represents a novel species belonging to the genus , for which the name sp. nov. is proposed. The type strain is HL-MP18 (=KCCM 90405 =JCM 35639 ).