Concept of Water Potential in Plants
Dive into the concept of water potential in plants, exploring components like solute potential, pressure potential, matrix potential, and gravitational potential. Learn about methods to determine cell and soil water potential using instruments like psychrometers, pressure chambers, ryoscopic osmometers, and pressure probes. Understand how water moves between regions based on differences in free energy levels, and discover the key role of water potential in plant physiology.
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Presentation Transcript
UNIT - 01 :- SOIL AND PLANT WATER RELATIONS LECTURE - 02 :- CONCEPT OF WATER POTENTIAL; PLANT CELL AND SOIL WATER POTENTIAL AND THEIR COMPONENTS;METHODS TO DETERMINE CELL AND SOIL WATER POTENTIAL
INTRODUCTION Water potential term was coined by Slatyer and Taylor (1960). It is modern term which is used in place of DPD. The best way to express spontaneous movement of water from one region to another is in terms of the difference of free energy of water between two regions (from higher free energy level to lower free energy level). It is represented by Greek letter. The value is measured in bars, pascals or atmospheres. Water always moves from the area of high water potential to the area of low water potential. Water potential of pure water at normal temperature and pressure is zero.
COMPONENTS OF WATER POTENTIAL a. Solute potential or osmotic potential ( s) b. Pressure potential ( p) c. Matrix potential ( m) d. Gravitational potential ( g)
METHODS TO DETERMINE CELL AND SOIL WATER POTENTIAL Four instruments that have been used extensively to measure , , and are described here:- a. Psychrometer, b. Pressure chamber, c. Ryoscopic osmometer d. Pressure probe.
