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Department of Microbiology, Oregon State University, Corvallis, OR 97331, USA
Correspondence
Stephen J. Giovannoni
steve.giovannoni{at}orst.edu
Three brownish-yellow bacterial strains were isolated from the western Sargasso Sea by high-throughput culturing methods and characterized by polyphasic approaches. All isolates were Gram-negative, strictly aerobic, chemoheterotrophic, non-motile short rods that contained carotenoid pigments. Phylogenetic analyses based on 16S rRNA gene sequences, DNADNA hybridization and DNA G+C content, along with phenotypic characteristics, revealed that they belonged to the same species. The strains utilized a wide range of substrates, including pentoses, hexoses, oligosaccharides, sugar alcohols, organic acids and amino acids, as sole carbon sources. The DNA G+C content of the isolates ranged from 57·6 to 59·9 mol%. The predominant cellular fatty acid constituent was C18 : 1
7c, whilst C16 : 0, C18 : 0 and C19 : 0
8c cyclo were also abundant. The organism related most closely to these strains, as determined by 16S rDNA sequence comparison, was the recently described species Aurantimonas coralicida (93·393·8 % similarity). Phylogenetic analyses indicated that the strains formed a distinct and deep evolutionary lineage of descent, together with A. coralicida, within the order Rhizobiales of the
-Proteobacteria. This lineage could not be associated with any of the ten known families in the order Rhizobiales. From polyphasic evidence, it is proposed that the strains be placed into a novel genus and species, Fulvimarina pelagi gen. nov., sp. nov. (type strain, HTCC2506T=ATCC BAA-666T=KCTC 12091T=DSM 15513T).
Published online ahead of print on 16 May 2003 as DOI 10.1099/ijs.0.02644-0.
The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of the strains in this study are AY178860AY178862.
A table showing habitats and isolation environments of the families in the order Rhizobiales is available as supplementary material in IJSEM Online.
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