Gibberellins in Immature Seeds of Pharbitis nil |
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| Authors: | Noboru Murofushi Nobutaka Takahashi Takao Yokota Saburo Tamura |
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| Institution: | Department of Agricultural Chemistry, The University of Tokyo, Bunkyo-ku, Tokyo |
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| Abstract: | A new gibberellin, gibberellin A20 (GA20), was isolated from immature seeds of morning-glory (Pharbitis nil). Its structure was established as 4aα, 7α-dihydroxy-1β-methyl-8-methylenegibbane-1α, 10β-dicarboxylic acid-1→4a lactone (I) on the basis of its physicochemical analysis as well as chemical evidences. GA20 shows marked growth promoting activities on dwarf maize d2 and d5 but weak activities on d1, rice seedling and dwarf pea. |
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