What are antitranspirants ?
Antitranspirants are compounds applied to the leaves of plants to reduce transpiration. They are used on Christmas trees, on cut flowers, on newly transplanted shrubs, and in other applications to preserve and protect plants from drying out too quickly.
How they reduce Transpiration (water loss)?
Antitranspirants may reduce transpiration in three different ways:
By reducing the absorption of solar energy and thereby reducing leaf temperatures and transpiration rates.
By forming thin transparent films which hinder the escape of water vapours from the leaves.
By promoting closure of stomata (by affecting the guard cells around the stomatal pore), thus decreasing the loss of water vapours from the leaf.