Psychromonas ingrahamii sp. nov., a novel gas vacuolate, psychrophilic bacterium isolated from Arctic polar sea ice

DNA, Bacterial 0301 basic medicine Base Composition 0303 health sciences Arctic Regions Polymers Fatty Acids Molecular Sequence Data Nucleic Acid Hybridization Genes, rRNA Sequence Analysis, DNA DNA, Ribosomal 6. Clean water Bacterial Typing Techniques RNA, Bacterial 03 medical and health sciences Microscopy, Electron, Transmission RNA, Ribosomal, 16S Environmental Microbiology Ice Cover Microscopy, Phase-Contrast Alaska Gammaproteobacteria Phylogeny
DOI: 10.1099/ijs.0.64068-0 Publication Date: 2006-04-20T18:36:00Z
ABSTRACT
A gas vacuolate bacterium, designated strain 37T, was isolated from a sea ice core collected from Point Barrow, Alaska, USA. Cells of strain 37Twere large (6–14 μm in length), rod-shaped, contained gas vacuoles of two distinct morphologies, and grew well at NaCl concentrations of 1–10 % and at temperatures of −12 to 10 °C. The DNA G+C content was 40 mol%. Whole-cell fatty acid analysis showed that 16 : 1ω7ccomprised 67 % of the total fatty acid content. Phylogenetic analysis of 16S rRNA gene sequences indicated that this bacterium was closely related to members of the genusPsychromonas, with highest sequence similarity (96.8 %) toPsychromonas antarctica. Phenotypic analysis differentiated strain 37TfromP. antarcticaon the basis of several characteristics, including cell morphology, growth temperature range and the ability to hydrolyse polymers. DNA–DNA hybridization experiments revealed a level of relatedness of 37 % between strain 37TandP. antarctica, providing further support that it represents a distinct species. The namePsychromonas ingrahamiisp. nov. is proposed for this novel species. The type strain is 37T(=CCUG 51855T=CIP 108865T).
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