Which component of media helps in regulating osmotic potential?
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Answer:
Water potential and components
The most commonly used parameter to characterize plant water status is water potential (Ψ). Total water potential (Ψ) has four components: the osmotic potential (ψs), pressure potential (ψp), matric potential (ψm), and gravitational potential (ψg):
Explanation:
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Water potential and components
The most commonly used parameter to characterize plant water status is water potential (Ψ). Total water potential (Ψ) has four components: the osmotic potential (ψs), pressure potential (ψp), matric potential (ψm), and gravitational potential(ψg):
[3]Ψ=ψs+ψp+ψm+ψg
Osmotic potential (ψs) results from dissolved solutes in cell sap and is proportional to soluteconcentration and inversely proportional to cell water volume. ψs in plants is always negative and decreases as solutes concentrate during plant dehydration. Pressure potential is a measure of tissue turgor produced by the diffusion of water into the protoplast of cells enclosed by largely inelastic cell walls. Matric potential (ψm) arises from the action, on water, of electrostatic forces of attraction associated with cell wall and colloidal surfaces, and of capillary forces associated with narrow transport vessels. In plants it is considered to be negligible. Gravitational potential (ψg) results from gravitational forces acting on the water within plants. On account of the gradient of ψg with height of 0.01 MPa m− 1, ψg is normally negligible compared with the other components of plant Ψ; it is only considered to be significant in very tall trees. In most situations, total plant water potential is considered to be the sum of the pressure potential (ψp) and osmotic potential (ψs).