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Article Abstract
Several strains of a previously undescribed bacterial species were isolated from mature hybrid trees suffering from bleeding cankers at various geographic locations in the UK. The strains were Gram-negative, facultatively anaerobic, and partial sequencing of the gene revealed that the strains belong to the genus with the closest phylogenetic neighbours being and . Further investigation using a polyphasic approach was undertaken to determine the taxonomic position of the novel species. Phylogenies based on the 16S rRNA gene and multilocus sequence analysis of partial housekeeping gene sequences of , , and revealed that the strains formed an independent cluster within the genus . The phenotypic and chemotaxonomic assays demonstrated that the strains could be differentiated from the closest relatives. Genome analysis of representative strains revealed DNA-DNA hybridization values below the threshold for species delimitation, although the average nucleotide identity values obtained when compared to (95.9-96%) were slightly higher than the suggested cut-off value of 95%. However, as all other data suggests that the strains belong to a novel taxon that can be differentiated from the closest relatives, we propose that the strains represent a novel species in the genus , sp. nov. (type strain WC1b.1=LMG 32575=NCPPB 4697).
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