The application of the three resistance inducers Trigonelline (N‐Methyl‐nicotinic acid), Isonicotinic acid methyl ester and the culture filtrate of Bacillus subtilis (B 50) to barley resulted in a reduction of infection with powdery mildew up to 65 %. When the isolated high molecular‐weight DNA was hydrolized to single bases the genomic DNA methylation of induced resistant plants was reduced between 3.1 % and 4.8 % compared to the control. On the basis of the given results the hypothesis that inducers could change the DNA structure is discussed considering further information from literature about gene regulation.
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Kraska et al. (1993) studied this question.
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