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Laboratori de Microbiologia, Facultat de Farmacia, Universitat de Barcelona, Av. Joan XIII s/n, 08028 Barcelona, Spain
Correspondence
Jesús Guinea
jguinea{at}farmacia.far.ub.es
Eleven psychrophilic bacteria isolated from Antarctic coastal marine environments were subjected to a polyphasic taxonomic study. The isolates were oxidase-positive, halotolerant, Gram-negative, non-motile coccobacilli with a strictly oxidative metabolism. The DNA G+C content ranged from 44 to 47 mol%. DNA–DNA hybridization experiments showed six homology groups, two of them related at the species level to the type strain of Psychrobacter immobilis, LMG 7203T (70–83 %). The highest DNA relatedness of two other groups to known Psychrobacter species was found to the type strain of Psychrobacter glacincola, LMG 21282T (51–57 %), and no significant similarity was found between Psychrobacter type strains and the last two groups. The predominant cellular fatty acids detected were typical of the genus Psychrobacter and included 18 : 1
9c, 16 : 17c and 17 : 18c. 16S rRNA gene sequence analysis confirmed that the strains isolated belonged to the genus Psychrobacter. The results of the study assigned five isolates to P. immobilis, three isolates to P. glacincola and three isolates to novel Psychrobacter species. The names Psychrobacter luti sp. nov. (type strain NF11T=LMG 21276T= CECT 5885T) and Psychrobacter fozii sp. nov. (type strain NF23T=LMG 21280T =CECT 5889T) are proposed for these organisms.
Detailed physiological and biochemical properties and fatty acid compositions of the Antarctic isolates, transformation assay results and DNA–DNA hybridization results are available as supplementary material in IJSEM Online.
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