Gibberellin Transport from the Cotyledon to Plumule in the Flowering ofPharbitis nil

Abstract

Uniconazole applied to cotyledons inhibited the flowering response in Pharbitis nil. The application of gibberellin A₁ (GA₁) to cotyledons overcame the effect of uniconazole and restored the flowering response. The transport of GA₁ from cotyledons to plumules was confirmed by GC-MS analyses. The results indicate that GAs transported from cotyledons are concerned with regulating the endogenous level of GAs in plumules.