1887

Abstract

DNA from 26 strains, namely 11 ‘typical’ and 15 so-called ‘atypical’ strains, was used to assess the taxonomic relatedness within the species. The genomes were characterized by determination of DNA base composition, DNA:DNA reassociation, calculation of sequence divergence following reassociation, and by genome size estimations. By comparison with DNA obtained from controls and the group, strains were determined to be correctly placed with respect to genus and species. subspecies (the ‘typical’ group) was an extremely homogeneous taxon. The ‘atypical’ strains were more diverse, but distinct biotypes were recognizable. The first biotype included several geographically diverse isolates from goldfish. The second recognizable biotype included strains isolated from European carp. Other ‘atypical’ isolates could not be grouped but showed enough internal homology to be retained within the species. The subspecies and were found to be closely related to the motile aeromonads. It is considered that the present classification of is unsuitable and should be restructured to include subspecies , subspecies (to include the present subspecies ), and the reintroduced subspecies

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1988-02-01
2022-01-23
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