title: Triterpene phytoalexins from strawberry fruit.
abstract: Strawberry cv. Houkouwase is resistant to infection by Colletotrichum fragariae. The formation of antifungal compounds was observed in unripe fruit which had been wounded and inoculated with conidia of C. musae. Three antifungal compounds were isolated and identified as euscaphic acid, tormentic acid and myrianthic acid. Myrianthic acid inhibited the growth of C. musae at 3 microg, and euscaphic and tormentic acids showed inhibitory effects at 100 microg. A quantitative analysis of their contents showed that the triterpenes increased in wounded fruit, and in wounded and inoculated fruit, but not in non-treated fruit. These findings indicate that unripe fruit of Houkouwase produced the triterpenes as phytoalexins. The triterpene phytoalexins seem to be involved in the resistance of strawberry to the fungus.
authors.affiliation: Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Japan. hirai@kais.kyoto-u.ac.jp
authors.forename: N
authors.initials: N
authors.lastname: Hirai
authors.forename: M
authors.initials: M
authors.lastname: Sugie
authors.forename: M
authors.initials: M
authors.lastname: Wada
authors.forename: E H
authors.initials: EH
authors.lastname: Lahlou
authors.forename: T
authors.initials: T
authors.lastname: Kamo
authors.forename: R
authors.initials: R
authors.lastname: Yoshida
authors.forename: M
authors.initials: M
authors.lastname: Tsuda
authors.forename: H
authors.initials: H
authors.lastname: Ohigashi
mesh_terms: D000890:Anti-Infective Agents / Q000737:chemistry*; D020231:Colletotrichum / Q000276:immunology; D005638:Fruit / Q000737:chemistry* / Q000276:immunology; D007113:Immunity, Innate; D010935:Plant Diseases; D010936:Plant Extracts / Q000737:chemistry* / Q000276:immunology; D012717:Sesquiterpenes; D013729:Terpenes / Q000737:chemistry*; D000094162:Phytoalexins
chemical_list: D000890:Anti-Infective Agents; D010936:Plant Extracts; D012717:Sesquiterpenes; D013729:Terpenes; D000094162:Phytoalexins