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Laboratorium voor Microbiologie, Vakgroep Biochemie, Fysiologie en Microbiologie, Universiteit Gent, K. L. Ledeganckstraat 35, B-9000 Gent, Belgium
Correspondence
Stefanie Van Trappen
stefanie.vantrappen{at}UGent.be
A taxonomic study was performed on 26 strains isolated from microbial mats in Antarctic lakes of the Vestfold Hills and the McMurdo Dry Valleys. Phylogenetic analysis based on 16S rRNA gene sequences placed these strains within the Rhodobacter group of the 
-subclass of the Proteobacteria. Sequence similarity values for the strains with their nearest phylogenetic neighbours (Jannaschia, Octadecabacter and Ketogulonicigenium) ranged between 94·0 and 95·8 %. DNA–DNA hybridizations and comparison of repetitive extragenic palindromic DNA–PCR (rep-PCR) fingerprinting patterns revealed that these strains are members of three distinct species. The isolates are Gram-negative, chemoheterotrophic, non-motile rods and their DNA G+C contents range from 59·4 to 66·4 mol%. Whole-cell fatty acid profiles are similar and the primary fatty acid in all the strains is 18 : 1 
7c (74·1–87·7 % of total). Genotypic results together with phenotypic characteristics allowed the differentiation of these species from related recognized species of the -Proteobacteria and the strains are assigned to a new genus, Loktanella gen. nov., with three novel species: Loktanella salsilacus sp. nov. (type species), consisting of ten strains with LMG 21507T (=CIP 108322T) as type strain; Loktanella fryxellensis sp. nov., consisting of 12 strains with LMG 22007T (=CIP 108323T) as type strain; and Loktanella vestfoldensis sp. nov., consisting of four strains with LMG 22003T (=CIP 108321T) as type strain.
Published online ahead of print on 23 January 2004 as DOI 10.1099/ijs.0.3006-0.
The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of strains LMG 22007T, LMG 22003T, LMG 21507T, LMG 22000, LMG 22002 and LMG 22006 are AJ582225, AJ582226, AJ440997, AJ582228, AJ582229 and AJ582227, respectively.
Normalized rep-PCR profiles and a dendrogram are available as supplementary material in IJSEM Online.
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