Morphologie ultrastructurale des dictyosomes dans les cellules des meristemes radiculaires d'Allium sativumL.: effets du barbital

摘要

In meristematic root tip cells ofAllium sativumL. treatment with barbital under appropriate conditions results in a marked increase in the number of Golgi cisternae and a progressive decrease in the rate of release of Golgi vesicles. Connections between endoplasmic reticulum and Golgi bodies, indicated by OsO4staining, which presumably involve transitional vesicles are not disrupted. The significance of multivesicular bodies containing small Golgian vesicles is discussed. The results show that formation of Golgi cisternae from endoplasmic reticulum is still possible but that their maturation with production of elaborated substances is progressively inhibited.