28-Norcastasterone is biosynthesized from castasterone |
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Authors: | Fujioka S Noguchi T Sekimoto M Takatsuto S Yoshida S |
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Affiliation: | RIKEN, The Institute of Physical and Chemical Research, Saitama, Japan. sfujioka@postman.riken.go.jp |
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Abstract: | Metabolic experiments with deuterium-labeled castasterone in seedlings of Arabidopsis thaliana, Oryza saliva 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, [2H3]28-norcastasterone was identified as a metabolite of [26,28-2H6]castasterone, indicating that castasterone is the biosynthetic origin of 28-norcastasterone. Moreover, the natural occurrence of 28-norcastasterone 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. |
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