Identification of two chromone phytoalexins in the sweet pea, Lathyrus odoratus |
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Authors: | David J. Robeson John L. Ingham Jeffrey B. Harborne |
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Affiliation: | Phytochemical Unit, Plant Science Laboratories, University of Reading, Reading, RG6 2AS, U.K. |
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Abstract: | A major phytoalexin isolated from the Helminthosporium Carbonum-inoculated leaflets and pods of Lathyrus odoratus has been identified by spectroscopic procedures as 5,7-dihydroxy-3-ethylchromone (lathodoratin). Small amounts of the corresponding 7-O-methyl ether (methyl-lathodoratin) are also formed by this plant. Both compounds similarly occur as phytoalexins in the closely related legume L. hirsutus but are absent from the other Lathyrus species examined. The unusual 3-substitution of the chromone nucleus appears to be essential for fungitoxicity since the synthetic isomer 5,7-dihydroxy-2-ethylchromone is apparently inactive. |
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Keywords: | Vicieae Leguminosae sweet pea phytoalexins chromones 5,7-dihydroxy-3-ethylchromone fungitoxicity. |
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