Induced Resistance in Pepper Leaves Infiltrated with Purified Bacterial Elicitors from Xanthomonas campestris pv. vesicatoria

Cell components (lipopolysaccharide (LPS), exopolysaccharide (EPS), capsular glycoproteins and the cell envelope) were extracted and purified from cells of compatible and incompatible isolates of Xanthomonas campestris pv. vesicatoria and infiltrated into pepper leaves in an attempt to protect them against a compatible isolate. All cell components induced protection but only EPS and the cell envelope elicited phytoalexins. Therefore, resistance mechanisms other than phytoalexins may exist in pepper leaves and appear to be more effective than phytoalexins.