title: Halomonas alkaliantarctica sp. nov., isolated from saline lake Cape Russell in Antarctica, an alkalophilic moderately halophilic, exopolysaccharide-producing bacterium.
abstract: The taxomony of strain CRSS (DSM 15686(T)=ATCC BAA-848(T)) isolated from Cape Russell in Antarctica (Ross Sea, 74 52.35 S 163 53.03 E) was investigated in a polyphasic approach. The morphological, physiological and genetic characteristics were compared with that of related species of the genus Halomonas. The isolate grew optimally at pH 9.0, 10% NaCl at 30 degrees C. The cells were Gram-negative aerobic rods able to produce exopolysaccharide. They accumulated glycine-betaine, as a major osmolyte, with minor components ectoine and glutamate. The strain CRSS biosynthetised alpha-glucosidase. The polar lipid profile consisted of phosphatidylethanolamine, phosphatidylglycerol and diphosphatidylglycerol as major components. Ubiquinone with nine repetitive unities (Q9) was the only quinone found and the fatty acid composition was dominated by C18:1 (53%). The G+C content of DNA was 55.0mol% and its phylogenetic position was established by 16S rRNA gene sequencing as a member of the genus Halomonas. For physiological, chemotaxonomic and genetic features (DNA-DNA hybridisation) it is proposed to classify the isolate as a new species for which we propose the name Halomonas alkaliantarctica sp. nov.
authors.affiliation: Istituto di Chimica Biomolecolare (ICB), CNR, Via Campi Flegrei 34, Comprensorio Olivetti, 80078 Pozzuoli (Na), Italy.
authors.forename: Annarita
authors.initials: A
authors.lastname: Poli
authors.forename: Enrico
authors.initials: E
authors.lastname: Esposito
authors.forename: Pierangelo
authors.initials: P
authors.lastname: Orlando
authors.forename: Licia
authors.initials: L
authors.lastname: Lama
authors.forename: Assunta
authors.initials: A
authors.lastname: Giordano
authors.forename: Francesca
authors.initials: F
authors.lastname: de Appolonia
authors.forename: Barbara
authors.initials: B
authors.lastname: Nicolaus
authors.forename: Agata
authors.initials: A
authors.lastname: Gambacorta
mesh_terms: D000864:Antarctic Regions; D001482:Base Composition; D044822:Biodiversity; D004269:DNA, Bacterial / Q000737:chemistry; D004275:DNA, Ribosomal / Q000235:genetics; D020459:Genes, rRNA; D019015:Geologic Sediments / Q000382:microbiology*; D020632:Halomonas / Q000737:chemistry / Q000145:classification* / Q000302:isolation & purification / Q000502:physiology*; D006863:Hydrogen-Ion Concentration; D008055:Lipids / Q000032:analysis; D008969:Molecular Sequence Data; D010802:Phylogeny; D011135:Polysaccharides, Bacterial / Q000378:metabolism*; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012965:Sodium Chloride / Q000378:metabolism
chemical_list: D004269:DNA, Bacterial; D004275:DNA, Ribosomal; D008055:Lipids; D011135:Polysaccharides, Bacterial; D012336:RNA, Ribosomal, 16S; D012965:Sodium Chloride