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Five hundred eighty-eight strains, representing Xanthomonas albilineans, X. fragariae, ten pathovars of X. campestris, and Stenotrophomonas maltophilia from ornamentals, were subjected to fatty acid methyl ester (FAME) analyses. Quantitative variance among FAME profiles enabled identification of the four species with 100% accuracy. Dendrogram cluster analysis placed strains of X. albilineans remotely from those of the other two Xanthomonas species and S. maltophilia. Whereas some profiles of pathovars of X. campestris were distinct, strains within X. albilineans, X. fragariae, and S. maltophilia were homogeneous by their conserved FAME ratios. Pathovars of X. campestris that had conserved profiles were fittonia, hederae, malvacearum, pelargonii, and zinniae. FAME profiles of X. campestris pathovars begoniae, dieffenbachiae, fici, maculifoliigardeniae, and poinsettiicola were, however, quantitatively diverse. These pathovars did not form discrete subgroups, and intercalated randomly with one another on the dendrogram. Certain species or pathovars of X. campestris which have homogeneous FAME profiles can easily be identified with fatty acid analysis; however, pathovars of X. campestris with heterogeneous profiles are not readily identified by fatty acid analysis. |
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