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Effect of growth regulators on parthenocarpic fruit set in Capsicum annuum

Leszek S. Jankiewicz, Amando Espinosa Flores, Ryszard Górecki, Mirosława Staniaszek

Research Institute of Vegetable Crops
Konstytucji 3 Maja 1/3, 96-100 Skierniewice, Poland

The effect of growth regulators on parthenocarpic fruit set was investigated in the sweet pepper cv. Erekta and Stano in a 2-year experiment. The plants were grown in pots in a greenhouse thoroughout or were transplanted to ground beds in a foil tunnel. Growth regulators were applied daily during 5 consecutive days as droplets of a solution on the emasculated flowers. Gibberellin A3 (GA3) at 100 mg·dcm-3 was the most effective stimulator of parthenocarpy. Other growth regulators added to gibberellic acid i.e. napthaleneacetic acid (NAA), napthoxyacetic acid, benzolinon, and putrescine did not markedly improve its effect on the fruit set. The flowers treated with benzyladenine alone at 30 mg·dcm-3 were almost all shed. A high percentage of abscission also occurred in flowers treated with benzolinon. The resulting parthenocarpic seedless fruits were almost always misshapen and smaller than the seeded fruits of untreated control plants. The admixture of NAA at 10-40 mg·dcm-3 to GA3 caused an increase in fruit size as compared with the treatment with GA3 alone. The developing fruits, both seedless and seeded (in untreated controls), inhibited correlatively the formation of new generative organs (flower buds, flowers, and young fruits) and caused their abundant abscission.

Jankiewicz L.S., Flores A.E., Górecki R., Staniaszek M., 1991. Effect of growth regulators on parthenocarpic fruit set in Capsicum annuum. Folia Horticulturae III/2: 3-16.