Abstract
The central part of the haustorium of Osyris alba L. contains a cambium which is continuous from the mother root to the vicinity of the "absorbing cells." It centripetally differentiates tracheary elements which make up a vascular core, the xylem bridge, connecting the vessels of the parasite root to those of the host root. In the differentiating cambial cells, a first stage of activity of the Golgi apparatus, which is related to the development of the secondary wall thickenings, is evident. This stage is marked by the presence of numerous vesicles containing an electron dense material and of multivesicular bodies lying near the plasmalemma. The cells also contain numerous spherical granules which, while being mainly proteinaceous, also contain some potassium, calcium, and sulfur. The composition of these granules, the fact that their surrounding membrane is studded with numerous ribosomes and the fact that they often form short chains in a common membranous profile lead us to conclude that they are elaborated in the endoplasmic reticulum. Later in the course of differentiation of those cells, a second stage of activity of the Golgi apparatus can be observed, with the numerous vesicles showing a light content this time. This phase precedes a lysis process during which the cells lose all their cytoplasmic content. Only the granules remain in the differentiated tracheids. [Journal translation]
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