Why can salt cause a water deficit in plants even though the soil has plenty of water?

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Tendency of water to favor one side more than another. Water moves from an area of high potential to low potential. Predicts which way water diffuses.

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Presentation transcript:

Why can salt cause a water deficit in plants even though the soil has plenty of water?

Given that the plant cell in the picture is maintaining a constant volume, what can you deduce about the water potential of the plant cell and the solution in the beaker?

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From AP Biology Exam Equation Sheet Water Potential (  )  p +  s  p = pressure potential  s = solute potential The water potential will be equal to the solute potential of a solution in an open container, since the pressure potential of the solution in an open container is zero. The Solute Potential of the Solution  s = –iCRT i = ionization constant (for sucrose this is 1.0 because sucrose does not ionize in water) C = Molar concentration R = Pressure constant (R = liter  bar/mole  K T = Temperature Kelvin (273 + °C)