Page 10 - LN-cH-11

Deplasmolysis
The process in which the plasmolysed cell when placed in pure water or hypotonic
solution, builds up a turgor pressure (in which water enters the cell and cause the
cytoplasm to build up a pressure against the wall). It is mainly responsible for
enlargement and extensive growth of the cells. During this stage, water enters due to
endosmosis and cell again becomes turgid when protoplast attains its original shape
and size. As cell wall is rigid, the cell do not rupture. The pressure exerted against
rigid wall due to the entry of water by the protoplasts is called pressure potential, i.e.,
fp .
(i) Deplasmolysis should be followed immediately after plasmolysis otherwise the
cell protoplast becomes damaged permanently.
(ii) Pressure potential of a flaccid cell is zero because there is no net movement of
water in and out of the cell.
(iii) Cell wall is found in bacteria, fungi, algae some archea and plant cells (animals
and protozoans do not have cell wall).
Differences between Plasmolysis and Deplasmolysis