Cytological investigation of hybrid varieties of Begonia semperflorens |
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| Authors: | A E Zeilinga |
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| Institution: | (1) Institute of Horticultural Plant Breeding, Wageningen |
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| Abstract: | The production of Begonia semperflorens varieties has recently concentrated on the F1 types, because of their free-flowering habit, uniformity and reduced sensitivity to adverse conditions. As many of the F1 varieties are sterile, it was supposed that a differential ploidy in the species was present. The following is a study of the varietal development of the species since its introduction in 1828 and of the chromosome numbers of the different varieties. In a series of crosses it was proved that the triploids resulted from tetraploid x diploid crosses, which are sterile. At the same time it could be observed that the heterosis effect, which is most manifest in the triploids, results in a better response to adverse conditions. The inheritance of dwarfness, which is an important feature of the species, was studied. |
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