chapter  fourteen
14 Pages


ByOtto J. Schwarz, Robert M. Beaty

The ability of plant tissues to form various organs de novo (organogenesis) has long been an object of interest and practical utility. The ancient Chinese successfully cloned selected genotypes of forest trees through the organogenic process of adventitious rooting of woody cuttings. The process of organogenesis provides the basis for asexual plant propagation largely from nonmeristematic somatic tissues. In its broadest sense, development is the process that results in a functional, mature organism. Organogenesis is a developmental process that is in some ways unique to plants. The callus tissue, containing cells that have dedifferentiated into a less-determined, morphologically more flexible form, serves as the starting point for de novo organogenesis. The process of dedifferentiation involves reversion to a less committed, more flexible/plastic developmental state that may or may not give rise to callus tissue. The induction phase occurs between the time the tissue becomes "competent" and the time it becomes fully "determined" for primordia production.