Effects of Light, Abscisic Acid, and 6N-Benzyladenine on the Metabolism of [3H]Gibberellin A4 in Seeds and Seedlings of Lettuce, cv. Grand Rapids

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Abstract
Gibberellin A4 (GA4) can substitute for light in the germination of Grand Rapids lettuce seeds. Seeds imbibed in [3H]GA4 do not convert this to other GAs prior to, or immediately following, visible germination: thus GA4 alone can promote radicle expansion. Abscisic acid inhibited [3H]GA4-induced germination, but did not significantly affect [3H]GA4 uptake or metabolism during germination. 6N-benzyladenine overcame the inhibitory effect of abscisic acid and increased [3H]GA4 uptake, although radicle emergence was delayed somewhat.