Two psychrophilic flavobacteria, designated AT1042T and AT1048T, were isolated from terrestrial samples from the Antarctic. Results of 16S rRNA gene sequence analyses indicated a close relationship of these isolates to Flavobacterium flevense (96.9 % similarity for strain AT1042T) and Flavobacterium psychrolimnae (97.0 % for strain AT1048T). 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 Flavobacterium. Phylogeny based on 16S rRNA gene sequences and several phenotypic characteristics could be used to differentiate these isolates from recognized Flavobacterium species. Despite high 16S rRNA gene sequence similarity (98.9 %) between strains AT1042T and AT1048T, 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 Flavobacterium. The names Flavobacterium weaverense sp. nov. (type strain AT1042T=IMSNU 14048T=KCTC 12223T=JCM 12384T) and Flavobacterium segetis sp. nov. (type strain AT1048T=IMSNU 14050T=KCTC 12224T=JCM 12385T) are proposed for these Antarctic isolates.
|Number of pages||6|
|Journal||International Journal of Systematic and Evolutionary Microbiology|
|Publication status||Published - 2006 Jun|
ASJC Scopus subject areas
- Ecology, Evolution, Behavior and Systematics