The fate of ['"C] gibberellin A, and [3 H] gibberellin A, was examined in senescing fruit of Shamouti orange (Citrus sinensis L. Osbeck) and tomato (Lycopersicon esculentum Mill .) . Gibberellin A, was highly persistent in Citrus peel (t 1/2 = 18 days) and to a lesser degree in tomato (t 1/2 = 5 .5 days) . Ethylene and ethephon caused a slight enhancement of gibberellin A3 metabolism in Citrus and tomato fruit, respectively . Gibberellin A, was metabolized by Citrus peel at a relatively high rate (t 1/2 < 24 h) and ethylene slightly reduced this rate . It is concluded that the ethylene-induced enhancement of senescence does not involve major effects on the deactivation of applied gibberellins .Abbreviations : GA" gibberellin A 3; GA" gibberellin A,
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