Ch#14 |Transportation | Lec #04 | Water Potential (FSc Bio part 1)@riffatjahan

WATER POTENTIAL:
Water molecules have kinetic energy by which they move rapidly and randomly from one place to another place in the liquid or gases.
Therefore greater the concentration of the water molecules in a system, the greater is the total kinetic energy of water molecules. This is called water potential .
WATER POTENTIAL:
Water molecules have kinetic energy by which they move rapidly and randomly from one place to another place in the liquid or gases.
Therefore greater the concentration of the water molecules in a system, the greater is the total kinetic energy of water molecules. This is called water potential .
Water Potential:
The measure of energy of water molecules which cause the water molecules to migrate across the permeable membrane is called water potential.
Water moves from a region of higher water potential to lower water potential.
Using this term osmosis can be defined as:
The movement of water molecules from a region of higher water potential to a region of lower water potential through a selectively permeable membrane.
Pure water has maximum water potential which is zero.
All solutions have lower water potential than pure water and so have negative value of water potential (at atmospheric pressure and at a specific temperature).
Osmotic (Solute) Potential:
It is a measure of the change in water potential of a system due to the presence of solute molecules.
Solute potential is always negative.
More solute molecules present, lower (more negative) is the solute potential.
Pressure Potential :
It is component of water potential and is equivalent to pumping water from one place to another.
If pressure greater than atmospheric pressure is applied to pure water or a solution, its water potential increases.
When water enters plant cells by osmosis pressure develops inside, the cell becomes turgid and the pressure potential is increased.
Simply potential can be defined as, it is the pressure of water exerted against the walls of the plant cell.
Thus the total potential is sum of solute potential pressure potential
Water Potential = Solute Potential + Pressure Potential
Applications:
The tendency for movement water can be, measured between any two systems by usingthe term water potential.
These two systems the water to move:
(i) From cell to cell in a plant
(ii) From soil to root
(iii) From leaf to air
(iv) From soil to air
The steeper the potential gradient the fasster is the flow of water.
In plant cells two factors determine the water potential.
(i) Solute concentration (Osmotic or solute potential)
(ii) Pressure generated when water enters into plant, cells swell up (Pressure potential)
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