Gibberellic acid and a mixture of gibberellin A4 and gibberellin A7 each induced seedless fruit development in plum. Parthenocarpic fruits grew more rapidly early in the season but their final diameters were only 60% of control. Hormones applied only to developing vegetative shoots and not to neighbouring flowers did not induce parthenocarpy. The role of hormones in fruit growth is discussed.
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D. I. Jackson (1968) studied this question.
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