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New Zealand strains of plant pathogenic bacteria classified by multi‐locus sequence analysis; proposal of Xanthomonas dyei sp. nov.
Author(s) -
Young J. M.,
Wilkie J. P.,
Park D.C.,
Watson D. R. W.
Publication year - 2010
Publication title -
plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.928
H-Index - 85
eISSN - 1365-3059
pISSN - 0032-0862
DOI - 10.1111/j.1365-3059.2009.02210.x
Subject(s) - biology , xanthomonas campestris , xanthomonas , botany , pseudomonas syringae , locus (genetics) , microbiology and biotechnology , bacteria , pathogen , genetics , gene
Strains of Xanthomonas isolated in New Zealand from diseased endemic and introduced plants, investigated in a multi‐locus sequence analysis (MLSA), were distributed primarily in two species. Strains from Dysoxylum , Hardenbergia , Liquidambar , Magnolia and Mahonia were members of Xanthomonas arboricola . Strains of Xanthomonas campestris pv. laureliae , X . campestris pv. eucalypti and strains from Aralia , Diospyros , Dysoxylum , Eriostemon , Eucalyptus , Metrosideros and Olea formed a population distinct from all known Xanthomonas spp. These latter strains have a unique fatty acid methyl ester profile and are considered to be members of a new Xanthomonas species, for which the name Xanthomonas dyei is proposed. Xanthomonas campestris pv. eucalypti and X . campestris pv. laureliae are considered to be pathovars of the new species and their reclassification as X . dyei pv. eucalypti and X . dyei pv. laureliae , respectively, is proposed. Strains previously identified as Pseudomonas syringae pv. dysoxyli from Dysoxylum spectabile , including the pathotype strain, were examined and found not to represent the pathogen originally described as P . dysoxyli . Other strains (proved to be pathogenic) from diseased D. spectabile , corresponding to the original description of P . dysoxyli , are members of X . dyei and the new combination X . dyei pv. dysoxyli is proposed. The geographic and evolutionary origins of X . dyei , apparently endemic to Australasia, and the adaptation of strains to the introduced host plants Aralia , Diospyros , Eriostemon , Metrosideros and Olea , are discussed. The origins of the X. arboricola strains isolated from Dysoxylum , Hardenbergia , Liquidambar , Magnolia and Mahonia pose a conundrum.