gen. nov., sp. nov. and gen. nov., sp. nov.: psychrophilic bacteria from Antarctic sea-ice habitats Free

Abstract

A group of pigmented, psychrophilic, strictly aerobic chemoheterotrophs isolated from sea-ice cores collected from coastal areas of eastern Antarctica was found to represent a novel 16S rRNA lineage within the gamma subclass of the , adjacent to the genus . The isolates are motile. Gram-negative, rod-shaped cells, which are psychrophilic and slightly halophilic, and possess an absolute requirement for seawater. Differences in phenotypic characteristics and DNA–DNA hybridization indicated the isolates formed two distinct taxa which have DNA G+C contents of 44–46 mol% and 40 mol%, respectively. Whole-cell fatty acid profiles of the isolates were however very similar and included 16:17, 18:17, 16:0 and 17:18 as the major fatty acid components. Overall, sufficient differences exist to distinguish the sea-ice strains from currently recognized bacterial genera. It is proposed the sea-ice strains represent a new genus, , which contains two species, Glaciecola punicea gen. nov., sp. nov. (ACAM 611) and gen. nov., sp. nov. (ACAM 615).

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1998-10-01
2024-03-28
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