Abstract
The persistence of gibberellin A3 on plant surfaces was examined using fruit of ‘Marsh’ seedless grapefruit (Citrus paradisi Macf.) and an inert glass model system. 14C-gibberellin A3 was applied to surfaces in aqueous treatment solutions or in waxing solutions. Dried-out treatment residues were removed by washing and analyzed for total and GA3-like radioactivity. Gibberellin A3 persisted without significant loss for at least 7 d in aqueous treatment solutions (pH 4.0 or 6.2) but was less persistent in the pH 10.4 waxing solution (t1/2=7 d).
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