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Moritella dasanensis sp. nov., a psychrophilic bacterium isolated from the Arctic ocean

¹ Department of Applied Polar Sciences, Korea Polar Research Institute, KORDI, 7-50 Songdo-dong, Incheon 406-840, Republic of Korea
² Biological Resources Research Department, National Institute of Biological Resources, Environmental Research Complex, Incheon 404-170, Republic of Korea

Correspondence
Sung-Ho Kang
shkang{at}kopri.re.kr

An aerobic, motile, Gram-negative, ice-active substance-producing, rod-shaped psychrophile, designated strain ArB 0140^T, was isolated from seawater collected from near a glacier in Kongsfjorden, Svalbard Archipelago, Norway. Phylogenetic analysis using 16S rRNA gene sequences indicated that strain ArB 0140^T showed a distinct phyletic line within the genus Moritella. Characteristic chemotaxonomic data [predominant isoprenoid quinone, Q8; major fatty acids, C_{14 : 0}, C_{14 : 1}, C_{16 : 0}, C_{16 : 1} and C_{22 : 6} (docosahexaenoic acid; DHA)] also corroborated the affiliation of strain ArB 0140^T to the genus Moritella. The maximal growth rate of the novel strain was observed at 9 °C, with a maximum temperature for growth of 18 °C. The genomic DNA G+C content was 46.9 mol%. Based on the data obtained from this polyphasic study, including DNA–DNA relatedness, physiological and biochemical tests and ice-controlling activity, strain ArB 0140^T was found to be genetically and phenotypically different from other recognized species of the genus Moritella. Therefore strain ArB 0140^T represents a novel species, for which the name Moritella dasanensis sp. nov. is proposed. The type strain is ArB 0140^T (=KCTC 10814^T=KCCM 42845^T=JCM 14759^T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of Moritella dasanensis sp. nov. ArB 0140^T is EF192283.

A scanning electron micrograph of cells of strain ArB 0140^T, a graph showing the growth rate of the strain over a range of temperatures and images showing the ice-modifying activity of strain ArB 0140^T and other species of the genus Moritella are available as supplementary figures with the online version of this paper.

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