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STOMATA & GUARD CELLS

STOMATA & GUARD CELLS. STOMATA CLOSURE IS SHORT-TERM AS CO2 MUST GET TO MESOPHYLL TURGOR PRESSURE CHANGES IN GUARD CELLS & REGULATE OPENING & CLOSING OF STOMA. TRANSPORT OF K⁺. WATER INTAKE SWELLS CELLS DUE TO K⁺MOVING IN & THEY BULGE TO OUTSIDE-OPEN

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STOMATA & GUARD CELLS

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  1. STOMATA & GUARD CELLS

  2. STOMATA CLOSURE IS SHORT-TERM AS CO2 MUST GET TO MESOPHYLL • TURGOR PRESSURE CHANGES IN GUARD CELLS & REGULATE OPENING & CLOSING OF STOMA

  3. TRANSPORT OF K⁺ • WATER INTAKE SWELLS CELLS DUE TO K⁺MOVING IN & THEY BULGE TO OUTSIDE-OPEN • WATER LOSS DUE TO K⁺ LEAVING CAUSES CELLS TO SAG TOWARD EACH OTHER-CLOSE

  4. K⁺ TRANSPORT • BLUE LIGHT TRIGGERSACTIVITY OF ATP-POWERED PUMPS K⁺ INTO GUARD CELL PLASMA MEMBRANES • K⁺INCREASES SOLUTE CONC.& WATER MOVES IN BY OSMOSIS

  5. AS K⁺ PASSIVELY LEAVES, SO DOES THE WATER • ABSCISIC ACID HORMONE CAUSES K⁺ TO DIFFUSE OUT OF GUARD CELL & STOMA CLOSES

  6. ABSCISIC ACID PRODUCED IN ROOTS TAKES K⁺ OUT OF ROOTS DURING DROUGHT • CIRCADIAN RHYTHMS (24-HOUR BIOLOGICAL CLOCK) ALSO AFFECT STOMATA OPENING & CLOSING

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