Abstract
A new antifungal substance against rice blast fungus ( Pyricularia oryzae), 5-(8′Z-heptadecenyl)resorcinol, was isolated from etiolated rice seedlings together with a mixture of its homologues with C 13, C 15, and C 17 saturated alkyl chains. Its structure was determined by 1NMR, 13C-NMR, and MS spectra. Its ED 50 was ca 40μg/ml. These 5-alkylresorcinols were newly produced after germination and the concentration reached 50 μg g −1 fresh weight on day 6.
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