This article does not cite any references or sources. (July 2006) Please help improve this article by adding citations to reliable sources. Unverifiable material may be challenged and removed.

Plant cell under different enviroments

Before plasmolysis...

...and after.

Plasmolysis is a 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. Image File history File links Question_book-3. ... Image File history File links Turgor_pressure_on_plant_cells_diagram. ... Image File history File links Turgor_pressure_on_plant_cells_diagram. ... Download high resolution version (795x729, 208 KB) Epidermal cells of Rhoeo discolor. ... Download high resolution version (795x729, 208 KB) Epidermal cells of Rhoeo discolor. ... Download high resolution version (1656x1527, 809 KB) Epidermal cells of Rhoeo discolor after plasmolysis. ... Download high resolution version (1656x1527, 809 KB) Epidermal cells of Rhoeo discolor after plasmolysis. ... Osmosis is the spontaneous net movement of water across a semipermeable membrane from a region of high solvent potential to an area of low solvent potential, up a solute concentration gradient. ... Osmosis is the spontaneous net movement of water across a semipermeable membrane from a region of high solvent potential to an area of low solvent potential, up a solute concentration gradient. ... diffusion (disambiguation). ...

Turgidity

It has been suggested that this article or section be merged with Turgor pressure. (Discuss)

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. Image File history File links Merge-arrows. ... This article or section does not cite its references or sources. ... Osmosis is the spontaneous net movement of water across a semipermeable membrane from a region of low solute concentration to a solution with a high solute concentration, down a solute concentration gradient. ... In biology, protoplasm is the living substance inside the cell. ... Turgor (also called turgor pressure or osmotic pressure) is the pressure that can build in a space that is enclosed by a membrane that is permeable to a solvent of a solution such as water but not to the solutes of the soluton. ...

Plasmolysis

If a plant cell is placed in a more concentrated salt (hypertonic) solution, it loses water and hence turgor pressure, making it 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. The equivalent process in animal cells is called crenation. The liquid content of the cell leaks out due to diffusion. Effect of different solutions on blood cells Plant cell under different environments In biology, a hypertonic cell environment has a higher concentration of solutes than inside the animal or plant cell. ... Turgor (also called turgor pressure or osmotic pressure) is the pressure that can build in a space that is enclosed by a membrane that is permeable to a solvent of a solution such as water but not to the solutes of the soluton. ... Flaccid is a term used in medicine to refer to an object that is soft, or not tense. ... In biology, protoplasm is the living substance inside the cell. ... Cytorrhysis is the complete collapse of a plant cells cell wall within plants due to the loss of water through osmosis. ... This article or section does not cite its references or sources. ...

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. Osmosis is the spontaneous net movement of water across a semipermeable membrane from a region of low solute concentration to a solution with a high solute concentration, down a solute concentration gradient. ...

See also

• Crenation
• Cytolysis, where the cell bursts rather than shrinks.

This article or section does not cite its references or sources. ... Cytolysis is the lysis, or death, of cells due to the rupture of the cell membrane. ...

Sources

• Longman GCSE Biology by Phil Bradfield and Steve Potter

External links

• Pictures of plasmolysis in Elodea and onion skin
• Wilting and plasymolysis