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International Journal of Systematic and Evolutionary Microbiology, Vol 50, 901-907, Copyright © 2000 by Society for General Microbiology
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EP Ivanova, LA Romanenko, J Chun, MH Matte, GR Matte, VV Mikhailov, VI Svetashev, A Huq, T Maugel and RR Colwell
Center of Marine Biotechnology, University of Maryland Biotechnology Institute, 701 E. Pratt St, Baltimore, MD 21202, USA
Two bacterial strains, KMM 227(T) and 231(T), were isolated from seawater samples collected from the north-western Pacific Ocean at a depth of 4000--5000 m and were characterized using polyphasic taxonomy. Both were Gram-negative, psychrotolerant, heterotrophic, aerobic and required NaCl for growth (0.6--15.0%). The temperature for growth was 4--30 degrees C. Both strains were rod-shaped, with a single flagellum. However, strain KMM 231(T) revealed a single long fimbrium. Cellular fatty acids detected in the isolates were predominantly odd-numbered and iso-branched, with 15 and 17 carbons (ca. 70%). Also present were saturated and monounsaturated straight-chain fatty acids. Results of phylogenetic analyses, employing three tree-making methods, strongly indicated that the two strains formed a distinct lineage within a clade containing the genera Alteromonas, Colwellia and Pseudoalteromonas, in the gamma-Proteobacteria. The two strains shared 16S rDNA sequence similarity of 96.9% and genomic DNA relatedness of 27%; the latter was determined by dot-blot hybridization. The strains were differentiated by the presence of fimbria, production of chitinase, ability to grow on 15% NaCl and BIOLOG profiles. Given the polyphasic evidence accumulated in this study, it is proposed that the two deep-sea isolates be classified in the genus Idiomarina gen. nov., as Idiomarina abyssalis sp. nov. (type strain is KMM 227(T)) and Idiomarina zobellii sp. nov. (type strain is KMM 231(T)).
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