The biosynthesis of jasmonic acid: a physiological role for plant lipoxygenase |
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Authors: | B A Vick D C Zimmerman |
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Institution: | U. S. Department of Agriculture, ARS Department of Biochemistry North Dakota State University Fargo, North Dakota 58105 USA |
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Abstract: | Linolenic acid was converted to a cyclic product, 12-oxo-phytodienoic acid, by lipoxygenase and hydroperoxide cyclase enzymes present in Vicia faba pericarp. Isotope labeling studies in which U-14C] 12-180] oxo-phytodienoic acid was incubated with thin sections of pericarp tissue showed that 12-oxo-phytodienoic acid is a biosynthetic precursor to jasmonic acid, a plant growth regulator which promotes senescence. Key enzymes proposed for this pathway are a reductase enzyme which reduces a double bond in the cyclopentenone ring, and beta-oxidation enzymes which remove six carbons from the carboxyl end of the molecule. |
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