Plasmolysis is the contraction of cells within plants due to the loss of water through osmosis. It is the cell membrane peeling off of the cell wall and the vacuole collapsing.
Plasmolysis is an effect of osmosis in plants. Osmosis is the net diffusion of water across a selectively permeable membrane, such as a cell membrane, from an area of higher water concentration to an area of lower water concentration.
shrinking of cytoplasm in a living cell caused by loss of water
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...
When a freshwater (or terrestrial) plant is placed in sea water, its cells quickly lose turgor and the plant wilts.
A phenomenon in walled cells in which the cytoplasm shrivels and the plasma membrane pulls away from the cell wall when the cell loses water to a hypertonic environment.
plasmolysis Osmotic condition in which a cell loses water to its outside environment.
plasmolysis (plaz-MAWL-ə-səs) n. Separation of the plasma membrane from the cell wall resulting from shrinkage of the cytoplasm in a hypertonic environment.
Online Biology Dictionary (PLAST-) ...
plasmolysis The osmotic removal of water from the cytoplasm and vacuole, causing the cytoplasm to pull away from the cell wall and clump in the center.
At this point the pressure potential is zero and so the water potential of the cell is equal to its solute potential. This process is called plasmolysis and the cell is said to be plasmolysed.
Plant cells placed in a hypertonic solution will undergo plasmolysis, a condition where the plasma membrane pulls away from the cell wall as the cell shrinks. The cell wall is rigid and does not shrink.
When the potassium leaves the guard cell, the water also leaves, causing plasmolysis of the cells, and a closing of the stoma. Stomata occupy 1% of the leaf surface, but account for 90% of the water lost in transpiration.
See also: Lysis, Cell, Plant, Membrane, Cell wall