Stomatal regulation of transpiration, anti-transparent, internal water deficit and its physiological implications
Stomatal Regulation of Transpiration:- 1. General Introduction:- > The loss of water in the vapour form from the exposed parts of a plant is called transpiration. > The loss of water due to transpiration is quite high: i. 2 litres per day in Sunflower. ii. 36 - 45 litres in Apple. iii. Up to 1 tonne per day in Elm tree. > Rather 98-99% of the water absorbed by a plant is lost in transpiration. Hardly 0.2% is used in photosynthesis while the remaining is retained in the plant during growth. 2. Types of Transpiration:- a. Based upon plant organ:- i. Foliar Transpiration:- - Most of the transpiration occurs through foliar surface or surface of the leaves. - Foliar transpiration accounts for over 90% of the total transpiration. ii. Cauline Transpiration:- - Young stems, flowers, fruits, etc. also transpire a lot. - Mature stems transpire very little. b. Based upon plant surface:- i. Stomatal Transpiration:- - It is the most import...