Future research on the growth, development and flowering of flower bulbs must be unique and not homogeneous. There are two major reasons : (1) the genera that are used commercially were introduced either long ago or only recently and (2) the genera have different economic impacts. These aspects directly affect the importance and the nature of the research programmes. Independent of the genus or the sophistication of the research programmes, the ultimate goal of the research must be to provide bulb growers and users with the technologies that will allow them to: (1) have plants with highly efficient growth cycles, (2) obtain products with high quality market standards, and (3) be able to reproduce the results year-in and year-out. These goals (optimizing plant growth, quality, and reproducibility) provide the base of the presentation. We shall identify areas where research is needed and the nature of research that should be conducted. Several factors must be taken into account. They are: (1) research on the effects of external factors on physiological processes is necessary for the commercial use of any species; (2) basic research must be undertaken to obtain an understanding of fundamental processes like bulbing, floral induction, etc... ; (3) basic research often leads to the question of genetic control of the process. The latter point raises the question of which model(s) plant(s) should be used for basic research? It is clear that all research needs to be interdisciplinary. Also, that international cooperation and continuous funding are necessary for the research programmes to be effective.
Abstract. The changes in the contents of free and bound gibberellin-like activity (GA) of Tulipa gesne-iana L. cv. Ralph during development under 2 temperature conditions were studied. The results show that the conttnt of free GA of bulbs grown at 180 increased by 67 %o over the initial level during development. The bound GA showed a slight initial increase and was followed by a rapid decrease. In contrast, bulbs treated at 130 showed a marked decline in free GA and a 2-fold increase in the content of bound GA. However, after the transfer of these bulbs from 130 to 180 the free GA increased to the initial level while the bound GA decreased to a low level.The rate of floral shoot and root development and time of flowering were accelerated at 18°as compared to 130.From the data obtained, it was suggested that a temperature-sensitive interconversion mechanism between free and bound GA exists in tulip bulbs and that there is apparent synthesis or transformation of these phytohormones during development of the bulbs.The temperature reqtirements for growth and floral shoot development in tulip bulbs are generally satisfied by seasonal temperatures (7, 12). Gill anti co-workers ( .5 6) and Dickev (3)
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