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Roseisalinus antarcticus gen. nov., sp. nov., a novel aerobic bacteriochlorophyll a-producing -proteobacterium isolated from hypersaline Ekho Lake, Antarctica

Matthias Labrenz^1,, Paul A. Lawson², Brian J. Tindall³, Matthew D. Collins² and Peter Hirsch¹

¹ Institut für Allgemeine Mikrobiologie, Christian-Albrechts-Universität, Kiel, Germany
² School of Food Biosciences, University of Reading, PO Box 226, Reading RG6 6AP, UK
³ DSMZ – Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, Mascheroder Weg 1b, D-38124 Braunschweig, Germany

Correspondence
Matthias Labrenz
matthias.labrenz{at}io-warnemuende.de

A Gram-negative, aerobic to microaerophilic rod was isolated from 10 m depths of the hypersaline, heliothermal and meromictic Ekho Lake (East Antarctica). The strain was oxidase- and catalase-positive, metabolized a variety of carboxylic acids and sugars and produced lipase. Cells had an absolute requirement for artificial sea water, which could not be replaced by NaCl. A large in vivo absorption band at 870 nm indicated production of bacteriochlorophyll a. The predominant fatty acids of this organism were 16 : 0 and 18 : 17c, with 3-OH 10 : 0, 16 : 17c and 18 : 0 in lower amounts. The main polar lipids were diphosphatidylglycerol, phosphatidylglycerol and phosphatidylcholine. Ubiquinone 10 was produced. The DNA G+C content was 67 mol%. 16S rRNA gene sequence comparisons indicated that the isolate represents a member of the Roseobacter clade within the -Proteobacteria. The organism showed no particular relationship to any members of this clade but clustered on the periphery of the genera Jannaschia, Octadecabacter and ‘Marinosulfonomonas’ and the species Ruegeria gelatinovorans. Distinct morphological, physiological and genotypic differences to these previously described taxa supported the description of a new genus and a novel species, for which the name Roseisalinus antarcticus gen. nov., sp. nov. is proposed. The type strain is EL-88^T (=DSM 11466^T=CECT 7023^T).

Published online ahead of print on 30 July 2004 as DOI 10.1099/ijs.0.63230-0.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain EL-88^T is AJ605747.

A figure showing characteristic absorbance peaks for strain EL-88^T is available as supplementary material in IJSEM Online.

Present address: IOW – Baltic Sea Research Institute Warnemuende, Seestrasse 15, 18119 Rostock-Warnemuende, Germany.

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