Abstract
The problems dealt with in this chapter concern the control of organized or patterned differentiation of vascular tissues within the plant body by growth regulators. This organized differentiation of vascular tissues is characterized by a high degree of order. The tissues are formed in a predictable three-dimensional structure, which is typical of each species. Vascular tissues are formed continuously in the intact plant, as long as the plant grows from apical and lateral meristems. New tissues develop in dynamic relationship to one another. The vascular system is complex. It is composed of two kinds of conducting tissues: the phloem and the xylem, each of which is comprised of several types of cells (Fahn 1982).
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