Paeniglutamicibacter Terrestris Sp. Nov., Isolated From Phenanthrene-Degrading Consortium Enriched From Antarctic Soil

A novel bacterium, designated strain ANT13_2(T), was isolated from a phenanthrene-degrading consortium enriched from a soil sample collected near the Great Wall Station located in the southwestern area of King George Island, Antarctica. Following a polyphasic taxonomic study, a novel species belonging to the genus Paeniglutamicibacter was described. The strain was a Gram- stain-positive bacterium that exhibited a rod-coccus growth cycle. Strain ANT13_2(T) grew aerobically at an optimum temperature of 20-25 degrees C and at pH 7.0?8.0. Ribose, arabinose and glucose were detected as whole -cell sugars. The predominant menaquinone was MK-9. The diagnostic phospholipids were diphosphatidylglycerol, phosphatidylglycerol and an unidentified phospholipid. The predominant cellular fatty acids were anteiso- C15: 0 (67.7 %) and anteiso- C17: 0 (11.2 %). The DNA G+C content of the genomic DNA was 60.6 mol%. Based on 16S rRNA gene sequence analysis, strain ANT13_2(T) showed the highest similarities to Paeniglutamicibacter antarcticus SPC26T (98.9 %) followed by Paeniglutamicibacter gangotriensis Lz1y(T) (98.4 %), Paeniglutamicibacter sulfureus DSM 20167(T) (98.3%) and Paeniglutamicibacter kerguelensis KGN15(T) (97.9 %). The average nucleotide identity values between strain ANT13_2T and the type strains of P. antarcticus SPC26T and P. gangotriensis Lz1y(T) were 73.8 and 77.5 %, respectively, which are well below the 95-96 % species circumscription threshold. On the basis of this polyphasic taxonomic study, strain ANT13_2(T) is proposed to represent a novel species to be named Paeniglutamicibacter terrestris sp. nov. The type strain is ANT13_2(T) (=TBRC 11756(T)=NBRC 114615(T)).