osmotic potential

Osmotic potentialclick for a larger image
Fig. 239 Osmotic potential . Osmosis through a differentially permeable membrane.

osmotic potential (OP value)

a measure of the tendency of a solution to withdraw water from pure water by OSMOSIS across a differentially permeable membrane. Pure water has an osmotic potential of zero at one atmosphere pressure. The OP value of any solution is always negative. Osmotic pressure is a measure of the tendency for water to move into a solution by osmosis, and is expressed as a positive value.
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The osmotic potential of the soil solution can be calculated as follows:
The presence of salts in excess in the water causes reduction in crop growth and production, due to the decrease of the osmotic potential of the soil solution and occurrence of ionic toxicity and nutritional imbalances (Khan & Panda, 2008).
So, the decline in growth parameters especially fresh and dry weights of the plants under increasing salinity levels is linked to a rise in osmotic potential in water stressed plants (Turner, 1981) which may be due to high extra cellular solute concentration or decreased volumes of cell under drought.
Earlier studies reported that PEG can induce stress to the plant in a relatively controlled manner through modifying the osmotic potential of the nutrient solution culture (Meneses et al.
Acclimation of plants to water deficit is the result of different events, which lead to adaptive changes in plant growth and physio biochemical processes, such as changes in plant structure, growth rate, tissue's osmotic potential and antioxidant defenses.
After 7 days interval again grass was irrigated and grass samples were taken to determine non stressed osmotic potential on 11th of July 2013.
Michel and Kaufmann (1972) stated that the effects of concentration and temperature on osmotic potential of PEG-6000 solutions differ from those for most salts and sugars and apparently are related to structural changes in the PEG polymer and an empirical equation (Equation 1) permits calculation of Osmotic potential; from known concentrations of PEG-6000 over a temperature range of 15 to 35 C.
Experimental treatments included different levels of osmotic potential due to different concentrations of sodium chloride and poly ethylene glycol 6000 in four levels (0, -4, -8, -12 bar).
Photosynthetic measurements, photosynthetic pigments, plant dry weight, osmotic potential, and total soluble sugar content were not significantly different among all the treatments.