TIPOS DE PLASMOLISIS EN CELULAS CENTRIFUGADAS

Resumen

l. In Coccophora eggs, plasmolysis begins at the pointed end (the rhizoid pole) and also at the equatorial zone where the primary segmentation is to appear. This polar patter of the plasmolysis cannot be modified by stratification of the cellular contents when the egg is immersed in a hypertonic solution after being centrifuged at 25,000 times gravity.

2. In Spirogyra, plasmolysis begins at the both ends of the longitudinal axis of the cell, that also cannot be modified by centrifugation.

3. In Oedogonium, plasmolysis usually occurs at the basal end of each cell. The site of this plasmolysis is altered by centrifuging. When a centrifugal force of 25,000 times gravity is exerted towards the basal end of the cell, plasmolysis begins at the apical end.

4. In Halothrix, plasmolysis usually begins at the apical end of each cell, very clearly. When the cell is immersed in a hypertonic solution after the contents were stratified by centrifuging, it always begins at the centripetal end regardless of the axis of the cell.