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.
The amount of water in the cells of a vegetable affect the turgor pressure in the cells. The turgor pressure is how much pressure is in the cells. If the cells of the vegetable do not have enough water, the turgor pressure is low, so the plant wilts, making the vegetable look shriveled or small. If the cells of the vegetable have the right amount of water, the turgor pressure is high enough to keep the plant from wilting, so the vegetable looks healthy. If the cells of the vegetable have too much water, the turgor pressure is very high, and the cells may burst open, making the vegetable look shriveled and small.
When the turgor pressure is low in a plant it will start to slouch and wilt.
helps provide support for the plant
water
Because water has moved out of the vacuoles, the pressure is not enough to hold the plant's leaves erect.
Turgor
Inside most plant cells is a central water vacuole. The cell uses osmotic pressure to bring water into the cell. When the water vacuoles of the plant are filled with water it is said to have high turgor pressure.
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.
That would be the large central vacuole. In plant, not only does it contain water, it also controls turgor for when the plant receives a lot of water instead of simply lysing like in animal cells.
Turgor would be lost when a plant loses water. Salt water can cause water to move out of plant cells and the plant would wilt.
The Plant wilts and eventually dies. This is because the water has left the cell decreasing the turgor pressure water created by pushing the protoplast up against the cell wall. Eventually if water leaves the cell, the plant will wilt and die because it needs the water to carry out its processes like the light cycle.