Biosynthesis of the sesquiterpenoid,capsidiol, in sweet pepper fruits inoculated with fungal spores |
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Authors: | Fred C Baker Charles JW Brooks |
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Institution: | Chemistry Department, University of Glasgow, Glasgow, G12 8QQ, Scotland |
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Abstract: | Capsicum frutescens fruits inoculated with spore suspensions of Monilinia fructicola incorporated 1–4% of sodium acetate-2-14C] or RS-mevalonolactone-2-14C] into the phytoalexin, capsidiol. Labelled capsidiol was characterized by GC-RC, TLC-RC, gel chromatography (in conjunction with liquid scintillation counting) and GC-MS. The mode of incorporation of sodium acetate-1,2-13C2] into capsidiol, as indicated by the pattern of 13C-13C coupling from 13C NMR data, supports the hypothesis that the angular methyl group of the capsidiol skeleton arises by migration from the C-10 position of a eudesmane-type intermediate. |
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Keywords: | Solanaceae bell-pepper biosynthesis acetate-mevalonate pathway methyl migration phytoalexin eremophilane capsidiol |
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