1887

Abstract

Two psychrophilic flavobacteria, designated AT1042 and AT1048, were isolated from terrestrial samples from the Antarctic. Results of 16S rRNA gene sequence analyses indicated a close relationship of these isolates to (96.9 % similarity for strain AT1042) and (97.0 % for strain AT1048). Cells were non-motile and non-gliding. Flexirubin-type pigments were absent. Both isolates were psychrophilic, with an optimum and maximum growth temperature of about 15 and 20 °C, respectively. The major isoprenoid quinone, predominant cellular fatty acids and DNA G+C contents (35–37 mol%) were consistent with the placement of the Antarctic isolates in the genus . Phylogeny based on 16S rRNA gene sequences and several phenotypic characteristics could be used to differentiate these isolates from recognized species. Despite high 16S rRNA gene sequence similarity (98.9 %) between strains AT1042 and AT1048, they represented two distinct species as demonstrated by low genomic relatedness (34 %) and a number of differential phenotypic characters. The polyphasic data presented in this study indicated that the new isolates should be classified within two novel species in the genus . The names sp. nov. (type strain AT1042=IMSNU 14048=KCTC 12223=JCM 12384) and sp. nov. (type strain AT1048=IMSNU 14050=KCTC 12224=JCM 12385) are proposed for these Antarctic isolates.

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2006-06-01
2020-09-27
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