Grouping of Xanthomonas campestris pathovars of cereals and grasses by fatty acid profiling1

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Abstract
Fatty acid profiles were prepared for a range of strains representing all 14 Xanthomonas campestris pathovars from the Gramineae. Profiles were complex, containing up to 40 acids, most of which were iso‐ and anteiso‐branched acids. Grouping of profile types generally correlated with pathovar, although pvs translucens, hordei, cerealis, secalis and undulosa could not be differentiated. Pvs graminis, arrhenatheri, poae and phlei formed another profile type although there were some differences between the pathovars. These graminis and translucens groups had similar profiles but could usually be differentiated by the ratios of 15:0 iso/16:0 iso and 15:0 iso/15:0 anteiso fatty acid methyl esters. The other pathovars each had a very different profile type. Pvs oryzae and oryzicola had profiles which were very different from all others. Pv. vasculorum comprised at least two distinct profile types. This did not correlate with host species or geographic distribution. Fatty acid profiling can be used to identify strains of X. campestris pathovars from Gramineae.