Ultrastructure of the resin ducts of Mangifera indica L. (Anacardiaceae). I. Differentiation and senescence of the shoot ducts.
Joel D. M., Fahn A.
Author Affiliation: Hebrew University of Jerusalem, Jerusalem, Israel.
Annals of Botany 46 : 225-233
Abstract : Duct development in mango shoots starts with the disintegration of a file of cells to leave a cavity. Later the cells lining this cavity differentiate into cells secreting lipophilic compounds. As a result of growth and differentiation of the tissues around the duct its lumen becomes compressed and comes to resemble a branched narrow slit. Disintegration of epithelial cells occurs throughout all stages of development. Neighbouring cells partly fill the space left by disintegrating cells. At the end of the stage of secretion the cytoplasm of all the epithelial cells darkens preceding disintegration. When all the dark epithelial cells disintegrate the cavity widens and the neighbouring parenchyma cells substitute for the secretory epithelium without undergoing any significant change in their cytoplasm.