Abstract
Electrophoretic, histochemical and serological techniques were used to study the forms and activities of p-diphenol oxidase in healthy wheat leaves, wheat leaves that had been inoculated with incompatible races of stem rust, leaves that were rusted and in uredospores of stem rust. Three isoenzymes were detected, one in uredospores and two in infected, susceptible wheat leaves. However, these two forms were not detected in control leaves nor in actively growing, inoculated, resistant leaves. Histochemical observations suggest that the two isoenzymes found in the host tissue were secreted by the pathogen. An increase in the activity of one of these coincided with the appearance of flecks in the susceptible leaves.
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