1887

Abstract

Using sequences from the locus, we have produced a phylogeny of 188 strains from culture collections and identified species relatedness and subspecies clade structure within the genus. Of the six recognized species, , and were discriminated with long branch lengths. The clade containing the type strain included just one additional strain, isolated from banana in Colombia. Strains isolated from and species made up most of the clade containing the type strain, and the host range of this species was extended to include potato. The clade had the largest number of sequevars and branched into two major sister clades that contained all of the isolates, and were identified as phylotypes PI and PII. The host range was increased from six to 13 species, including potato. The sequence of an Australian sugar-cane strain was sufficiently distinct to rank as a new species-level branch. In contrast to these species, , and were distinguished with shorter branch lengths, indicating relatively closer relatedness. The sequence for the type strain of clustered separately from other strains of the species. However, sequence comparison of three additional loci revealed that the type strain grouped together with the six other strains that were sequenced. Analysis of all four loci indicated that the strains were most closely related to Three further branches (DUC-1, -2 and -3) were associated with these three species, which all diverged from a common origin and can be considered as a species complex. The large clade containing the type strain comprised 58 strains and had little sequence diversity. One sequevar accounted for the majority of these strains, which were isolated nearly exclusively from eight hosts from Europe. Isolation of this sequevar on multiple occasions from and (more recently) potato demonstrates that this lineage has become established in these species. The clade comprised 11 sequevars, and the known host range of the species was extended from eight to 19 species. New hosts included several ornamental species and potato. The clade DUC-1 was made up exclusively of potato strains originating from Europe, which had identical sequences, whilst DUC-2 strains were isolated mostly from a variety of monocotyledonous species. A single strain from sp. made up DUC-3. A single sequevar constituted the clade. The phylogenetic method described will provide a simple means for identification to the species and intraspecies level, which will support efforts to control these pathogens based on monitoring and surveillance.

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2009-10-01
2020-01-23
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