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Phenylalanine ammonia-lyase (PAL) activity in barley leaves was measured at intervals after inoculation with the powdery mildew pathogen Erysiphe graminis f.sp. hordei. Measurements were made at times that included the periods of attempted penetration by the E. graminis primary germ tube and appressorium. The results demonstrated that extractable enzyme activity increased at 6 h and between 12-15...
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