Gibberellins in Immature Seeds of Pharbitis nil

Part III. Isolation and Structures of Gibberellin Glucosides

Abstract

Seven gibberellin glucosides (F-I_??_F-VII) were isolated from immature seeds of Japanese morning-glory (Pharbitis nil). The structures were elucidated as 2-O-β-glucosyl-gibberellin A₃ (F-I), 2-O-β-glucosyl-gibberellenic acid (F-II), 2-O-β-glucosyl-isogibberellin A₃ (F-III), 3-O-β-glucosyl-gibberellin A₂₆ (F-IV), 3-O-β-glucosyl-gibberellin A₂₇ (F-VI) and 3-O-β-glucosyl-gibberellin A₂₉ (F-VII). The one of the glucosides (F-V) was identified as 3-O-β-glucosyl-gibberellin As isolated from Phaseolus multiflorus.