Abstract
Lignified papillae and haloes from Botrytis cinerea inoculated wheat leaves were highly resistant to in vitro degradation by fourteen fungal species. Wheat pathogens were generally no more capable of degrading the structures than non-pathogens. Papillae and haloes from leaves taken as early as 12 h after inoculation showed substantial resistance indicating the possible importance of relatively small amounts of lignin. Quantitative measurements of the release of carbohydrate from lignified and non-lignified walls by fungal culture filtrates supported these visual observations. The activities of laccase and p-coumaryl esterase in culture filtrates did not correlate with pathogenicity. The significance of the results is discussed in relation to the proposed role of lignification in the resistance of wheat to fungi.
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