Each of a pair of curved cells that surround a stoma, becoming larger or smaller according to the pressure within the cells.
- Major questions therefore remain unanswered on how water stress signals perceived at root and leaf locations are integrated at the guard cell to control stomatal behaviour.
- This will reduce the apoplastic pH and allow the uptake of K + and other ions into the guard cells so that, when aquaporins are opened, water will flow into the guard cell to initiate stomatal opening.
- The best documented system so far is the stomatal guard cell where two anion channels from the plasma membrane have been extensively characterized.
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