Water movement through membranes Plant Physiology UNI 2009.
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Transcript of Water movement through membranes Plant Physiology UNI 2009.
Water movement through membranes
Plant Physiology
UNI 2009
Pressure difference
Pipe #1
Pressure Potential = +1 barSolute Potential = -2 bars
Membranepasses water only
Pipe #2
Pressure Potential = +3 barsSolute Potential = -2 bars
Which way does the water move?
Pressure difference
Pipe #1
Pressure Potential = +1 barSolute Potential = -2 bars
Membranepasses water only
Pipe #2
Pressure Potential = +3 barsSolute Potential = -2 bars
Water (only) moves from higher to lower potential.
Solute difference
Pipe #1
Pressure Potential = +1 barSolute Potential = -2 bars
Membranepasses water only
Pipe #2
Pressure Potential = +1 barSolute Potential = -4 bars
Which way does the water move?
Solute difference
Pipe #1
Pressure Potential = +1 barSolute Potential = -2 bars
Membranepasses water only
Pipe #2
Pressure Potential = +1 barSolute Potential = -4 bars
Water (only) moves from higher to lower potential.
Pressure and solute differences--I
Pipe #1
Pressure Potential = +1 barSolute Potential = -1 bars
Membranepasses water only
Pipe #2
Pressure Potential = +3 barsSolute Potential = -4 bars
Which way does the water move?
Pressure and solute differences--I
Pipe #1
Pressure Potential = +1 barSolute Potential = -1 bars
Membranepasses water only
Pipe #2
Pressure Potential = +3 barsSolute Potential = -4 bars
Water (only) moves from higher to lower water potential.
Pressure and solute differences--II
Pipe #1
Pressure Potential = -4 bars Solute Potential = -1 bars
Membranepasses water only
Pipe #2
Pressure Potential = +2 barsSolute Potential = -8 bars
Which way does the water move?
Pressure and solute differences--II
Pipe #1
Pressure Potential = -4 barsSolute Potential = -1 bar
Membranepasses water only
Pipe #2
Pressure Potential = +2 barsSolute Potential = -8 bars
Water (only) moves from higher to lower water potential.
Pressure and solute differences--III
Pipe #1
Pressure Potential = -4 bars Solute Potential = -1 bars
Membranepasses water only
Pipe #2
Pressure Potential = +2 barsSolute Potential = -7 bars
Which way does the water move?
Pressure and solute differences--III
Pipe #1
Pressure Potential = -4 barsSolute Potential = -1 bar
Membranepasses water only
Pipe #2
Pressure Potential = +2 barsSolute Potential = -7 bars
No NET water movement: Pipes at equilibrium for water potential.