Abstract
Abstract At the beginning of the prophase of the first division, the first deposits of the special wall are visible at the angles of each mother cell. They are highly contrasted and finely fibrillar. At the end of the telophase I, the special wall fills the whole space between the primary wall and the plasmalemma. During this time, accumulation of vesicles arise from the fragmentation of the endoplasmic reticulum, and is observed on the surface of the mother cell. Lipidic globules, in relation with the reticulum, are expelled through the plasma-lemma. At the end of meiosis, the special wall surrounds the tetrads. Simultaneously, plasmalemma invaginations isolate the four daughter cells. The intersporal septa are continuous and have the same contrast as the special wall. Cytochemical tests show that the special wall is likely formed of callose associated with lipids and acid polysaccharides. L'origine de la paroi speciale (activite du reticulum endoplasmique, secretion lipidique), sa mise en place des la p...
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