Abstract

Contact with a surface stimulates the release of a liquid from conidia of Erysiphe graminis and the liquid has been shown to contain esterase activity. The present investigation demonstrates that the liquid exudate partially erodes the cuticle of barley leaves. The release of esterase into the liquid occurs in two stages. The second stage of release occurs between 10 and 15 min after contact and was shown to be temperature dependent and to be inhibited by cycloheximide. Cuticular erosion may provide a stimulus for subsequent morphological differentiation, such as appressorium formation, or it may enhance appressorial adhesion.

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