Theory of proton transport during opening and closing of stomata
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phenomenon was done by Levitt, who proposed this theory. According to him stomata opens by following mechanism. Closing of stomata: Plant hormone ABA-acts on guard cells, which interfere the exchange of K+ H+ ions in guard cells, results in reverse of rxn. of opening of stomata, hence stomata closed.
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There are two theories about the opening and closing of stomata:
- Potassium ion concentration theory
- Sugar concentration theory
Potassium ion concentration theory:
This is the recent theory in which ATP is used to actively pump the potassium ions of the adjacent cells into the guard cells.
Sugar concentration theory:
This the old theory in which the guard cells become turgid and bulbs out words due to their thin outer wall, thus widening the stomatal opening lying in between.
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