Some Effects of Gibberellin on Flowering and Fruit Setting.

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Abstract
Parthenocarpic fruit development in the tomato and earlier flowering in several plants was induced by treatment with gibberellin (GB). For induction of parthenocarpy the response to GB was similar to that of indole-3-acetic acid but effective concentrations extended below those reported for any indole compound. Earlier flowering in crops that responded to GB occurred from a pronounced acceleration of vegetative growth, and in the case of head lettuce the elimination of the head as a mechanical barrier. GB did not specifically influence the flowering process since the amount of vegetative growth expressed as leaf numbers preceding the first flowers was not altered.