Each of a pair of curved cells that surround a stoma, becoming larger or smaller according to the pressure within the cells.
More example sentences
- 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.
Definition of guard cell in:
- The British & World English dictionary