Silver staining of sodium dodecyl sulfate-lysed cells of Xanthomonas campestris pv. vesicatoria electrophoretically separated in polyacrylamide gel revealed broad, dark gray bands in the low molecular weight region. The molecular weight of these bands was characteristic for each of the two major phenotypic groups identified in our X. c. vesicatoria collection. A 32- to 35-kDa band, designated a, was present in 192 of 197 tomato race 1 strains; whereas, a 25- to 27-kDa band, designated β, was present in all 55 strains of tomato race 2. Race 1 strains expressing an a band were unable to hydrolyze starch (Amy - ), and very few degraded pectate (Pec - ). In contrast, most race 2 strains were Amy + and Pec + [...]
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H. Bouzar (1994) studied this question.