Unformatted text preview: surrounding soil areas. • This combination of forces (transpiration and cohesion) is sufficient to move water upward against the forces of gravity. • In addition, the diameter of vessels and tracheids promotes cohesion. • It also means that a plant disadvantage, water lost by transpiration, can be turned around to do something beneficial for the plant. For all of this to work, one must have an unbroken column of water. Air bubbles in the column dramatically affect water movement. A rupture of the water column is called cavitation and vessels affected will no longer function. The air or water vapor blockage that forms after the cavitation is called an embolism....
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- Fall '09
- Plants, tracheids promotes cohesion, negative water pressure, root water potential