Amount by which water potential is reduced due to presence of solute is called

The amount by which water potential is reduced due to the presence of solute is called Solute potential.
Solute potential (Ψ_s), also called osmotic potential, is negative in a plant cell and zero in distilled water. Solutes reduce water potential by consuming some of the potential energy available in the water.
Solute potential (Ψ_s) decreases with increasing solute concentration; a decrease in Ψ_s causes a decrease in the total water potential.