1887

Abstract

Seven novel, cold-adapted, strictly aerobic, facultatively oligotrophic strains, isolated from Antarctic sea water, were investigated by using a polyphasic taxonomic approach. The isolates were Gram-negative, chemoheterotrophic, motile, rod-shaped cells that were psychrotolerant and moderately halophilic. Buds were produced on mother and daughter cells and on prosthecae. Prostheca formation was peritrichous and prosthecae could be branched. Phylogenetic analysis based on 16S rRNA gene sequences indicated that these strains belong to the - and are related to the genus , with 98·3 % sequence similarity to and 98·0 % to , their nearest phylogenetic neighbours. Whole-cell fatty acid profiles of the isolates were very similar and included C, C 7, C 8 and C 8 as the major fatty acid components. These results support the affiliation of these isolates to the genus . DNA–DNA hybridization results and differences in phenotypic characteristics show that the strains represent a novel species with a DNA G+C content of 43–45 mol%. The name sp. nov. is proposed for this novel species; the type strain is ANT 69a (=LMG 21861=DSM 15691). An emended description of the genus is given.

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2004-07-01
2020-01-28
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vol. , part 4, pp. 1157 – 1163

Digitized representation of normalized rep-PCR profiles and dendrogram.

Strains investigated in this study and their isolation source.

Differential phenotypic characteristics of species.

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