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Per wikipedia's article on wilting: http://en.wikipedia.org/wiki/Wilting
Edited the article. The article before the revision can be found here: http://en.wikipedia.org/w/index.php?title=Wilting&oldid=497326200
Wilting refers to the loss of rigidity of non-woody parts of plants. This occurs when the turgor pressure in non-lignified plant cells falls towards zero, as a result of diminished water in the cells. The process of wilting modifies the leaf angle distribution of the plant (or canopy) towards more erectophile conditions.
Lower water availability may result from:
drought conditions, where the soil moisture drops below conditions most favorable for plant functioning;
the temperature falls to the point where the plants vascular system can not function.
high salinity, which causes water to diffuse from the plant cells and induce shrinkage;
saturated soil conditions, where roots are unable to obtain sufficient oxygen for cellular respiration, and so are unable to transport water into the plant; or
bacteria or fungi that clog the plant's vascular system.
Internet trolls have clogged the plant's vascular system.
Edited the article. The article before the revision can be found here: http://en.wikipedia.org/w/index.php?title=Wilting&oldid=497326200