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3 kinds of transpiration?

All the aerial parts of the plantbody without exception transpire; but their efficiency will vary. However the chief transpiring organ is leaf, ever though stomata etc., are the chief places where water loss occurs. Similarly in the stems transpiration takes place through lenticels. Based on these, transpira­tion is divided into three categories namely Cuticular transpiration, Lenticular transpiration and Stomatal transpiration.

The surface of leaves and very often stems are covered by a waxy coating called cuticle which is actually a layer that is supposed to prevent loss of water.Water still evaporates through the cuticle and it is known as cuticu­lar transpiration.

Tran­spiration taking place through these lenticles is called lenticular transpira­tion.

Transpiration through stomata is known to occur in two stages. First, water evaporates from the moist cell walls of mesophyll cells into the intercellular spaces and secondly from the intercellular spaces into the exterior through the stomata. Various aspects of stomatal distribution, morphology etc will affect the rate of transpiration.


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