How do the guard cells regulate opening and closing of stomatal p… - Vidyadip

Question

How do the guard cells regulate opening and closing of stomatal pores?

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Answer

Opening and closing of stomata is regulated by gain or loss of turgidity of their guard cells. During opening of stomata, guard cells withdraw $K ^{+}$ions from surrounding epidermal cells, followed by absorption of water from them. As a result, guard cells swell up and become turgid. Their outer thin and elastic walls bend outwardly followed by outward movement of thicker inner walls. The latter creates a pore in between the two guard cells. During closure movement of stomata, guard cells send out $K ^{+}$ions. Water also passes out. Guard cells become flaccid. Their inner thick walls come to touch each other. The stomatal pore gets closed.

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