Abstract
Summary The effects of growth-regulating substances and environmental conditions on the composition of Begonia franconis LIBBM. inflorescences were analysed. The inflorescences are generally composed of two male flowers and one terminal female flower. Auxins, gibberellins, and cytokinins, added to the branch apices, as well as low light intensity, promoted male flowering by increasing the number of male flowers. Removal of branches as well as application of cytokinins induced ramification of the inflorescences by outgrowth of the normally dormant axillary bud in the bract of male flowers. A transition of male flowers into female flowers was not observed. A model of the sex-regulating mechanism in relation to hormones and environmental conditions is put forward. On the principle that female development requires a high nutritional level it is suggested that the level of assimilates is important in regulating sex expression, hormones influencing the sex of flower buds through their regulation of the flow of assimilates.
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