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Articles

Flowering in Bougainvillea

A Function of Assimilate Supply and Nutrient Diversion

^a Department of Environmental Horticulture, University of California, Davis, California 95616

Reproductive development, whether expressed as first node to flower or numbers of inflorescences developing, is promoted in direct relationship to leaf area and in inverse relationship to the numbers of axillary branches developing. Per cent soluble solids in the reproductive shoots vary with reproductive development. Cytokinin treatments promote inflorescence development and per cent soluble solids, further supporting a nutritional hypothesis in the control of flowering in Bougainvillea "San Diego Red." Gibberellin treatments inhibit reproductive development completely without significant lowering of per cent soluble solids, which is counter to expectations for a nutritional hypothesis. A closer examination of the reproductive axes, the tissues in which morphogenetic change occurs, must be made for the gibberellin-treated tissues.

² A portion of this paper was presented in the report: Sachs RM, WP Hackett, A Ramina, C Maloof. Photosynthetic assimilation and nutrient diversion as controlling factors in flower initiation in Bougainvillea `San Diego Red' and Nicotiana tabacum cv. Wis. 38. In H Clysters, R Marcelle, M Van Poucke, eds, Photosynthesis and Plant Development. Dr. W Junk, The Hague.