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Plasmolysis is the contraction of cells due to the loss of water through osmosis in plants and bacteria. Osmosis is the net diffusion of water across a selectively permeable membrane, such as a cell membrane, from an area with a high water potential to an area with a low water potential.[1]
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Turgidity
A plant cell in a more dilute salt solution will absorb water by endosmosis, so that the increased volume of water in the cell will increase pressure, making the protoplasm push against the cell wall, a condition known as turgor. Turgor makes plant cells push against each other in the same way and is the main method of support in non-woody plant tissue. Plant cell walls resist further water entry after a certain point, known as full turgor, which stops plant cells from bursting as animal cells do in the same conditions.
Plasmolysis
If a plant cell is placed in a more concentrated salt (hypertonic) solution, the plant cell loses water and hence turgor pressure, making the plant cell flaccid. Plants with cells in this condition wilt. Further water loss causes plasmolysis: pressure decreases to the point where the protoplasm of the cell peels away from the cell wall, leaving gaps between the cell wall and the membrane. Eventually cytorrhysis – the complete collapse of the cell wall – can occur. There is no mechanism in plants to prevent excess water loss in the same way as excess water gain, but plasmolysis can be reversed if the cell is placed in a weaker solution (hypotonic solution). The equivalent process in animal cells is called crenation. The liquid content of the cell leaks out due to diffusion. The cell collapse and cell membrane pulls away from the cell wall
Plasmolysis only occurs in extreme conditions and rarely happens in nature. It is induced in the laboratory by immersing cells in strong saline or sugar solutions to cause exosmosis, often using Elodea plants or onion epidermal cells, which have coloured cell sap so that the process is clearly visible.
See also
References
- ^ "Wiley InterScience :: JOURNALS :: New Phytologist". www3.interscience.wiley.com. Retrieved on 2008-09-11.
External links
- Pictures of plasmolysis in Elodea and onion skin
- Wilting and plasymolysis
Wikipedia content modification information:
- This page was last modified on 10 October 2008, at 23:58.
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