34 28-ノルカスタステロンはカスタステロンから生合成される

概要

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Metabolic experiments with deuterium-labeled castasterone in seedlings of Arabidopsis thaliana, Oryza sativa and Lycopersicon esculentum, and cultured cells of Catharanthus roseus were performed, and the metabolites were analyzed by GC-MS. In all the plant species examined, [26-^2H_3]28-norcastasterone was identified as a metabolite of [26,28-^2H_6]castasterone, indicating that castasterone is the biosynthetic origin of 28-norcastasterone. Natural occurrence of 28-norcastasterone and and 28-nortyphasterol in seedlings of A. thaliana has been demonstrated. This is the first report of the natural occurrence of 28-nortyphasterol in plants. Biological activities of these 28-norbrassinosteroids were evaluated using rice lamina inclination test. In this assay ,activity of 28-norcastasterone was shown to be ca. 10% of that of castasterone. Activity of 28-nortyphasterol was also shown to be ca. 10% of that of typhasterol.
植物化学調節学会の論文
2000-11-02