Isolement expérimental des cellules terminales de l'apex de Sphacelaria cirrosa (Roth) C. Agardh (Sphacelariales, Phéophycées) et analyse comparée de leurs potentialités morphogénétiques

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Abstract
In Sphacelaria, it is possible to isolate experimentally, through traumatisms, the apical cell or the subapical cell whose mode of functioning and role in organogenesis are strictly defined. After isolation, the morphogenetic potentialites of isolated cells are compared with those of similar cells in situ. The isolated apical cell, with its nucleus ready to divide, retains an auto-maintained mode of functioning, and reinitiates the development of the apex. The isolated subapical cell exhibits a different segmentation from that of a control cell, and gives rise to an axis. These differences in behavior may be related to polarity phenomena and to the existence of cell interactions controlling the morphogenesis of cells.