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When Plant Cells Lose Water

When Plant Cells Lose Water. Plant Physiology UNI 2009. WP = 0. SP = -15. PP = +15. Fully turgid cell. In equilibrium with pure water Solutes in cell “pull” water in Pressure positive Membrane pushed up against wall Wall stretched slightly (most cells) Leaf feels really stiff.

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When Plant Cells Lose Water

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  1. When Plant Cells Lose Water Plant Physiology UNI 2009

  2. WP = 0 SP = -15 PP = +15 Fully turgid cell • In equilibrium with pure water • Solutes in cell “pull” water in • Pressure positive • Membrane pushed up against wall • Wall stretched slightly (most cells) • Leaf feels really stiff

  3. Slight water loss (few %) • Slight water loss • Almost no change in water volume • Pressure changes significantly (still +) • Solute potential does not change significantly • Membrane still pushed up against wall • Wall still stretched slightly (most cells) • Leaf feels quite stiff WP = -10 SP = -15 PP = +5

  4. More water loss (few more %) • Slight further water loss • Almost no change in water volume • Pressure changes significantly (still +) • Solute potential does not change significantly • Membrane still pushed up against wall • Leaf not very stiff WP = -14 SP = -15 PP = +1

  5. More water loss (wilting) • Slight further water loss • Almost no change in water volume • Pressure now just at zero • Solute potential still about the same • Membrane just touching wall • Leaf wilted WP = -15 SP = -15 PP = 0

  6. Even more water loss(cell plasmolyzing) • Slight further water loss • More membrane pulling away from wall (not attached) • Pressure still zero (= atmosphere) • Significant change in water volume • Solute becomes more concentrated • Solute potential lower • Leaf still wilted, but alive WP = -20 SP = -20 PP = 0

  7. Yet more water loss(further plasmolysis) • Slight further water loss • More membrane pulling away from wall (not attached) • Pressure still zero (= atmosphere) • Significant change in water volume • Solute becomes more concentrated • Solute potential lower • Leaf still wilted, but alive WP = -25 SP = -25 PP = 0

  8. Lethal water loss • More further water loss • More membrane pulling away from wall (not attached) • Pressure still zero (= atmosphere) • Solute becomes more concentrated, solute potential lower • Irreversible loss of membrane & protein function WP = -40 SP = -40 PP = 0

  9. The End • Plants can lose turgor (pressure) and not be harmed • Cells can plasmolyze a bit and not be harmed • If cells become sufficiently dehydrated, metabolic functions are reduced • If they be come too dehydrated, they die

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