Antifungal activity of 1-phenyl-3-pentanone produced by Mycoleptodonoides aitchisonii against plant-pathogenic fungi

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  • ブナハリタケ(Mycoleptodonoides aitchisonii)が生産する1-phenyl-3-pentanoneの植物病原糸状菌に対する抗菌活性

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1-Phenyl-3-pentanone, a volatile compound produced by the edible mushroom Mycoleptodonoides aitchisonii ("Bunaharitake" in Japanese) has antifungal activity against plant-pathogenic fungi. To determine its antifungal spectrum and effective concentration, we investigated the effects of 1-phenyl-3-pentanone on mycelial growth and spore germination of several plant-pathogenic fungi; Alternaria alternata Japanese pear pathotype, A. brassicicola, Bipolaris sorokiniana, Botrytis cinerea, Cladosporium cucumerinum, Colletotrichum orbiculare, Corynespora cassiicola, Magnaporthe oryzae, and Pasalora fulva. The compound inhibited significantly mycelial growth and spore germination of all pathogens tested at concentrations of 5-10 ppm (w/v) as vapor. When the compound was removed from spores of the pathogens, the spores began to germinate indicating the fungistatic activity of the compound. Lesion formation on detached leaves of cabbage and tomato inoculated with spores of A. brassicicola and C. cassiicola, respectively, was also significantly inhibited at 5-10 ppm. The compound did not cause injury at the concentrations used on either of the detached leaves. Since 1-phenyl-3-pentanone is a nontoxic product of an edible mushroom and has fungistatic activity against broad fungal pathogens, it may have great potential as a safe agent for controlling fungal diseases.

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