1887

Abstract

The genus currently comprises 27 species with validly published names that are important crop and horticultural pathogens. We have constructed a phylogram from alignment of gyrase B () sequences for all xanthomonad species, both to indicate inter-species relatedness and as an aid for rapid and accurate species-level identification. The phylogeny indicated a monophyletic group, with and as the most ancestral species. Three species, , and , formed an early-branching group. Three clades were supported by high bootstrap values: group 1 comprised , and ; group 2 comprised , , , , and ; group 3 contained the remaining species, within which two further clades, supported by a 100 % bootstrap value, were identified. Group 3A comprised , , and , together with , and , whose names were recently validly published. Group 3B contained the monocot pathogens and . Two recently identified species, and , were poorly discriminated and were related closely to . Three species, , and , had identical sequences. Partial sequencing of a further five genes from these species found only minor sequence differences that confirmed their close relatedness. Although branch lengths between species varied, indicating different degrees of genetic distinctiveness, the majority (=21) were well-differentiated, indicating the utility of the method as an identification tool, and we now use this method for routine diagnosis of xanthomonad species.

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2007-12-01
2019-10-18
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