Apedia

A-Level Biology OCR A

Close Stomata Cells Plant Water Aba Guard Explain

Stomata close to prevent water loss; ABA released by leaf cells binds to receptors on stomatal guard cells, altering ion concentrations and reducing turgor, causing stomata to close.

Les stomates se ferment pour prévenir la perte d'eau ; l'ABA libéré par les cellules foliaires se lie aux récepteurs des cellules de garde stomatiques, modifiant la concentration ionique et réduisant la turgescence, ce qui entraîne la fermeture des stomates.

Front Explain why a plant might close its stomata and describe this process including the role of plant hormones.
Back Stomata closing:
  • They close to prevent water loss when no photosynthesis is occurring
  • Leaf cells release ABA
  • ABA binds to receptors on plasma membrane of stomatal guard cells, activating changes in ionic concentrations of the guard cells
  • This reduces water potential and therefore the turgor of cells, as a result stomata close

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