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The effect of gibberellins A4+7 on fruit set and seed set in unpollinated and pollinated ‘Sonia’ roses

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Abstract

The effect of GA4+7 (GA) on fruit and seed set of ‘Sonia’ roses unpollinated and pollinated with ‘Ilona’, was studied. GA at 0, 10, 50, 250 or 1250 ppm in water with 25% iso-propyl alcohol was applied 0, 7 or 14 days after emasculation. In general, GA improved fruit and seed set, and induced heavier, earlier ripening fruits. In the unpollinated and pollinated categories fruit weight and the number of achenes per fruit in comparable treatments were about the same. In the unpollinated category all achenes were parthenocarpic. In the pollinated category, 10 and 50 ppm GA after 14 days more than doubled the number of achenes per pollinated flower. Achenes with or without an embryo are a probable condition for fruit set. Effects of GA are discussed.

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Authors and Affiliations

  1. Institute for Horticultural Plant Breeding (IVT), P.O. Box 16, 6700 AA, Wageningen, The Netherlands

    Lidwien A. M. Dubois & D. P. de Vries

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  1. Lidwien A. M. Dubois
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  2. D. P. de Vries
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Dubois, L.A.M., de Vries, D.P. The effect of gibberellins A4+7 on fruit set and seed set in unpollinated and pollinated ‘Sonia’ roses. Plant Growth Regul 4, 75–80 (1986). https://doi.org/10.1007/BF00025351

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  • DOI: https://doi.org/10.1007/BF00025351

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