1887

Abstract

Three strains of and two strains of were analysed, together with reference and type strains of other species, for phenotypic traits, DNA–DNA relatedness, comparison of 16S rRNA gene sequences and presence of necrotic protein gene () homologues in order to clarify their phylogenetic relationships. A numerical analysis of phenotypic characteristics showed that and belong to the same cluster and share almost all morphological and biochemical traits that are important in the identification of species. DNA–DNA hybridization and phylogenetic comparisons of 16S rRNA gene sequences confirmed that the two species are genomically closely related. In contrast, pathological data showed that and cause two distinct diseases. Gene homologues of were detected in and other common scab species (, and ), but not in . To avoid confusion between agents causing separate diseases, it is proposed that the existing distinct species names are retained: involved in common scab and involved in netted scab.

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2006-12-01
2019-12-11
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