water potential and its component
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- There are three major components of water potential in a plant cell. These are: (a) Matrix potential, (b) Solute potential and (c) Pressure potential. Matrix potential (ψm) is the component of water potential which is determined by the attraction between hydrated colloidal molecules, cell wall etc., and water.
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Water potential is the energy required, per quantity of water, to transport an infinitesimal quantity of water from the sample to a reference pool of pure free water. To understand what that means, compare the water in a soil sample to water in a drinking glass. There are two components to water potential: solute concentration and pressure.
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