This hormone affects the opening and closing | vedclass

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(B) $ABA$ (Abscisic acid) causes stomata to close by inhibiting an $ATP$-dependent pump in the plasma membrane of guard cells.The application of exoge

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Abscisic acid

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(B) $ABA$ (Abscisic acid) causes stomata to close by inhibiting an $ATP$-dependent pump in the plasma membrane of guard cells.The application of exogenous $ABA$ on the leaves of normal plants causes the closing of stomata within a few minutes.$ABA$ acts in the presence of $CO_2$,which decreases the $pH$ of guard cells.$ABA$ induces the loss of $K^+$ ions,which decreases the osmotic concentration of guard cells compared to adjacent epidermal cells.This causes exosmosis,and the turgidity of the guard cells decreases,leading to stomatal closure.

This hormone affects the opening and closing of stomata.

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