Pseudomonas paeninsulae sp. nov. and Pseudomonas svalbardensis sp. nov., isolated from Antarctic intertidal sediment and Arctic soil, respectively

Two Gram-stain-negative, aerobic, rod-shaped, non-endospore-forming and motile bacterial strains, designated IT1137 T and S025 T , were isolated from an intertidal sediment sample collected from the Fildes Peninsula (King George Island, Maritime Antarctica) and a soil sample under red snow in the Ny-Ålesund region (Svalbard, High Arctic), respectively. The 16S rRNA gene sequence similarity values grouped them in the genus Pseudomonas . The two strains were characterized phenotypically using API 20E, API 20NE, API ZYM and Biolog GENIII tests and chemotaxonomically by their fatty acid contents, polar lipids and respiratory quinones. Multilocus sequence analysis (concatenated 16S rRNA, gyrB , rpoB and rpoD sequences), together with genome comparisons by average nucleotide identity and digital DNA–DNA hybridization, were performed. The results showed that the similarity values of the two isolates with the type strains of related Pseudomonas species were below the recognized thresholds for species definition. Based on polyphasic taxonomy analysis, it can be concluded that strains IT1137 T and S025 T represent two novel species of the genus Pseudomonas , for which the names Pseudomonas paeninsulae sp. nov. (type strain IT1137 T =PMCC 100533 T =CCTCC AB 2023226 T =JCM 36637 T ) and Pseudomonas svalbardensis sp. nov. (type strain S025 T =PMCC 200367 T = CCTCC AB 2023225 T =JCM 36638 T ) are proposed.