It is generally believed that there are three ways in which these cavities and ducts can form: 1) by lysigeny, a process involving the autolysis of a mass of mature secretion-filled glandular cells that release the secretion product as they degenerate; 2) by schizogeny, involving the separation of cell walls in the center of a group of glandular cells creating an intercellular space that enlarges greatly during development; 3) by schizolysigeny, a combination of the two processes, where cavities initiate schizogenously but further increase in size with autolysis of the glandular cells.
Although numerous lysigenous glands have been described in the last 140 years, most of these descriptions have been countered by other studies reporting schizogeny in same or related species (Tschirch & Stock, 1933; Cart & Carr, 1970; Thomson et al., 1976).
Since the glandular cells of other species could have similar sensitivity to fixative osmolarity, and since most reports of lysigeny in glands have been challenged by reports of schizogeny in the same or related species, we postulated that in general lysigeny may represent a false category of gland development.
He hypothesized that schizogeny in Ruta reflects the chemical differences between the methyl ketone-rich oil of Ruta and the oils of Citrus and Poncirus.
(1976) agreed with Cart and Cart (1970) that difficulties encountered preparing oil glands for microscopy was one reason for the conflicting reports of lysigeny and schizogeny. However, since Thomson et al.