Articles
HORMONAL CONTROL OF GROWTH AND DEVELOPMENT OF HYACINTH
The results of several experimental data concerning the effects of various exogenous growth regulators on the differentiation of bulblets, bud formation and growth, dormancy release and flowering, as well as on some metabolic activities in the bulbs at various stages of development were also discussed.
On the base of all available data, concerning the involvement of growth regulators in the control of hyacinth bulb development and growth, a pattern of hormonal control of these processes is proposed, here using hyacinth as a model plant object.
Several papers have been published concerning the correlations of growth and developmental phases with changes of endogenous hormonal activities in bulbous plants of many species.
It has also been discovered that in numerous bulbous plants the application of exogenous, synthetic plant hormones results in a modification of developmental processes including: acceleration of growth, substitution of the cold requirement, acceleration of the flowering period, stimulation of tissue differentiation and an increased vegetative propagation coefficient (Rees, 1972). Nevertheless, on the basis of all received observations it is still difficult to create a coherent model of the involvement of hormonal factors in regulation of growth and development of a given bulbous plant.
It comes from the fact that various hormones direct simultaneously physiological or biochemical processes, or different hormones play the same function in plants of various species.
For a better understanding of the mechanisms of hormonal control it became necessary to concentrate the research on one plant object and to study: its physiology in relation to endogenous hormonal status, the responses of the plant to exogenous growth regulators, and the responses of various metabolic pathways in the plant being exposed to certain environmental conditions and/or growth regulatory factors.
Ten years ago, we chose the hyacinth as a representative model of a bulbous plant using it as a target for all kinds of experiments toward the explanation of the complex role of hormonal factors in regulation of dormancy differentiation, vegetative propagation, flowering and growth, as well as in regulation of some enzymatic systems in various tissues of this plant.
On the basis of obtained results it has