When water leaves the plant cell, for example in osmosis, the pressure (created by the water) of the protoplast pushing against the cell wall will decrease. This pressure is known as turgor pressure and decreasing it will cause the cells to become soft/flaccid and so the plant will begin to wilt more and more as the turgor pressure decreases.
Turgor pressure pushes the plasma membrane against the cell wall of plant, bacteria, and fungi cells. An example of turgor pressure is osmosis which causes water to flow from an area of low solute concentration to an area of high solute concentration until the two areas are equal.
Since plant cells have a rigid wall, when water loads into a plant cell pressure can build up without the membrane bursting. The pressure from this overload and expansion of the inner cell membrane is called turgor pressure. Turgor pressure can be observed in swollen cells under microscopic examination.
"Definition: Turgor Pressure: also called turgidity, is the main pressure of the cell contents against the cell wall in plant cells. Turgid plant cells contain more water than flaccid cells and exert a greater osmotic pressure on its cell walls.
Turgor is a force exerted outward on a plant cell wall by the water contained in the cell. This force gives the plant rigidity, and may help to keep it erect. Turgor can result in the bursting of a cell."
http://forestry.about.com/od/foresttermsandglossary/g/turgor.htm
So, basically it's water pressure on the cell wall.
Turgor pressure helps describe the amount of water in a plant and how it relates to its firmness. A plant with low turgidity is low on water, or perhaps just naturally soft and flexible.
Turgor pressure is the pressure exerted by the water that is inside the cell, against the cell wall. This helps the plants stand upright.
The term turgor pressure refers to the process of a plasma membrane being pushed against a cell wall. This process happens in plants, bacteria, and fungi cells.
hard
The force that causes turgor pressure is osmosis.
When the turgor pressure is low in a plant it will start to slouch and wilt.
hydrostatic pressure or turgor (same thing)
Turgor pressure is usually calculated as the difference between water potential and osmotic potential. In herbaceous plants turgor pressure is almost solely responsible for maintaining an erect habit. Wilting of leaves is due to loss of turgor in the leaf.
turgor pressure, also turgidity, is the main pressure exerted by cell contents against the cell walls in plant cells
Turgor Pressure
The force that causes turgor pressure is osmosis.
Osmotic pressure across the cell wall, here called Turgor Pressure.
A plant wilts when it has a decreased turgor pressure.
When the turgor pressure is low in a plant it will start to slouch and wilt.
more solutes = less osmotic pressure = decreased turgor pressure
The plasma membrane is the structure associated with resisting turgor pressure.
hydrostatic pressure or turgor (same thing)
The pressure that builds in a plant cell as a result of osmosis is called turgor pressure.
wall pressure
Turgor pressure
Plant cells are not known to have negative turgor pressure values. However, there are times when plants will have low turgor pressures which may result into negative turgor pressure values.