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Pseudomonas guineae sp. nov., a novel psychrotolerant bacterium from an Antarctic environment

Laboratori de Microbiologia, Facultat de Farmacia, Universitat de Barcelona, Av. Joan XXIII s/n, 08028 Barcelona, Spain

Correspondence
Elena Mercadé
mmercade{at}ub.edu

Two Gram-negative, cold-adapted, aerobic bacteria, designated strains M8^T and M6, were isolated from soil collected from the South Shetland Islands. The organisms were rod-shaped, catalase- and oxidase-positive and motile by means of polar flagella. These two psychrotolerant strains grew between –4 and 30 °C. 16S rRNA gene sequence analysis placed strains M8^T and M6 within the genus Pseudomonas. DNA–DNA hybridization experiments between the Antarctic isolate M8^T and type strains of phylogenetically related species, namely Pseudomonas peli and Pseudomonas anguilliseptica, revealed levels of relatedness of 33 and 37 %, respectively. Strain M6 showed 99 % DNA similarity to strain M8^T. Several phenotypic characteristics, together with data on cellular fatty acid composition, served to differentiate strains M8^T and M6 from related pseudomonads. On the basis of the polyphasic taxonomic evidence presented in this study, it can be concluded that strains M8^T and M6 belong to the same genospecies, representing a novel species of the genus Pseudomonas, for which the name Pseudomonas guineae sp. nov. is proposed. The type strain is M8^T (=LMG 24016^T=CECT 7231^T).

An electron micrograph of a cell of strain M8^T, an extended phylogenetic tree for strains M8^T and M6 within the genus Pseudomonas and a table showing cellular fatty acid compositions are available with the online version of this paper.

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