ISHS Acta Horticulturae 226: International Symposium on Propagation of Ornamental Plants
FACTORS AFFECTING FRUIT AND SEED SET IN THE HYBRID TEA-ROSE 'SONIA' |
| Authors: | D.P. de VRIES, L. A.M. DUBOIS |
| Abstract:
In various years the effects of temperature, repeated pollination of the same flower, the time interval between emasculation and pollination and of the application of GA 4+7 on the fruit set, seed set and seed germination of roses were investigated in the large-flowered Hybrid Tea cv. 'Sonia', using 'Hadley' or 'Ilona' as pollinators. Optimum conditions for breeding with 'Sonia' are: greenhouse temperatures between 20 and 25°C, and pollinating at least twice between 1 and 4 days after emasculation. To improve mainly fruit set, GA may be applied 7 or 14 days after emasculation, in the concentrations 10, 50 or 250 ppm. Generalization of present results and the penetration of pollen tubes into the 'Sonia' ovary to explain maximum seed set are discussed. | |
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