PATHOGENESIS-RELATED PROTEINS IN NEAR-ISOGENIC BARLEY LINES INDUCED BY POWDERY MILDEW INFECTION

Induction of pathogenesis-related (PR) proteins in intercellular space s of near-isogenic barley leaves was examined after inoculation with a virulent and an avirulent race of powdery mildew (Erysiphe graminis f . sp. hordei) 24, 48, 72h post-inoculation. Induction of two the patho gen-induced proteins was ascertained 24 h post inoculation. 72h post-i noculation 7 to 8 major pathogen-induced proteins (bands on native PAG E) were identified. The accumulation pattern of PR proteins was very s imilar in both compatible and incompatible host-pathogen interaction b ut it was more expressive and appeared earlier at host-parasite incomp atibility than at compatibility. These results have confirmed that the resistance gene plays a key role in early recognition of pathogenes a s well as in early activation of the defence response.