Plant and Cell Physiology, 1978, Vol. 19, No. 7 1281-1288
© 1978
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Relationship between set, development and activities of growth regulators in tomato fruits
CNR, Laboratorio Biosintesi Vegetali, Via Bassini 15-Milano-Italy Istituto Sperimentale per l'Orticoltura Sezione di Montanaso Lombardo, Milano-Italy
The actions of plant regulators in set and development of fruits are well known. However, the presence and function of endogenous hormones in parthenocarpic fruits have still not been sufficiently investigated. A comparison between seeded and seedless fruits makes it possible to obtain a more accurate understanding of some relationships between growth regulators and stages of fruit development. Endogenous auxin and gibberellin activity levels and some growth parameters (fresh and dry weight, cell number and cell volume, DNA content) have been determined in tomato fruits (Lycopersicon esculentum Mill.) of the cultivar Ventura and of its isogenic parthenocarpic mutant. In both genotypes, auxin and gibberellin are present in the first week after anthesis, though at different concentrations and with different patterns. These two activities are involved in fruit setting. The simultaneous occurrence of maximum auxin concentration and of the beginning of cell enlargement, in both genotypes, shows that the activity present at this time starts fruit development and possibly determines the size of the fruits.
High auxin activity is observed only in seeded fruits 20–40 days after anthesis, and it is probably synthesized by seeds. Gibberellin activity is present, corresponding to the change in fruit development from the mature green to pink stages.
(Received February 16, 1978; )
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