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Pseudoalteromonas prydzensis sp. nov., a psychrotrophic, halotolerant bacterium from Antarctic sea ice

Antarctic CRC and Department of Agricultural Science, University of Tasmania, GPO Box 252–80, Hobart, Tasmania, Australia

Tel: +61 03 6226 2776. Fax: +61 03 6226 2642. e-mail: john.bowwman{at}utas.edu.au

ABSTRACT

Species of the genus Pseudoalteromonas are frequently isolated from marine ecosystems and appear to be particularly abundant in Antarctic coastal waters. Most Pseudoalteromon as strains isolated from sea ice and underlying seawater samples are phenotypically similar to the species Pseudoalteromonas antarctica and Pseudoalteromonas nigrifaciens. However, a minority of isolates were recognized by phenotypic, DNA-DNA hybridization and 16S rRNA-based phylogenetic studies to represent a distinct genospecies clustering at the periphery of the non-pigmented Pseudoalteromon as species clade. These strains are non-pigmented, halotolerant psychrotrophs that are capable of hydrolysing starch and chitin, and possess a DNA G+C content of 38–39 mol%. It is proposed that this group represents a novel species, Pseudoalteromon as prydzensis sp. nov., for which the type strain is ACAM 620^T.

Key Words: Pseudoalteromonas • sea ice • seawater • Antarctica • most probable number counting

The GenBank/EMBL/DDBJ accession number for the 16S rRNA sequence reported in this paper is U85855.

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