Abstract
The effect of cucurbitacin and of Ecballium extract on the formation of mRNA coding for laccase was examined in cultures of Botrytis cinerea grown with inducers of laccase formation, in the presence or absence of the inhibitory compounds. RNA was isolated from the cultures and probed with specific DNA probes for laccase. As an internal control, the RNA was probed for Botrytis β-tubulin mRNA. From an analysis of the results it is clear that cucurbitacin I and Ecballium extract specifically repress the amount of mRNA coding for laccase. This could account for the previously observed repression of laccase formation by cucurbitacins.
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