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Chapter 7.2

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Regulating Stomatal Activity

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Chapter 7.2

Regulating Stomatal Activity

Helmina Kmrzmn
1

diffusing osmosis potassium hydrogen accumulation close turgor potential turgid dependent lowering active increase guard flaccid proton electrochemical

During the day , light reaction of photosynthesis takes place . This results in ions accumulation in the guard cells . They will be pumped out of the guard cells , into subsequent cells . To balance the imbalance , ions will be pumped into the guard cells via transport . However , this leads to the of water potential of the cells compared to the neighbouring epidermis cells . This results in water molecules into the guard cells from neighbouring cells via . The pressure of guard cells increased , making them , resulting in the opening of stomata . Opened stomata promotes higher rate of gaseous exchange .

At night , when light dependent reaction doesn ? t occur , the pumps are inactive . There is no H + in the guard cells . Potassium ions are pumped out of the guard cells into the neighbouring cells . This results in the of water in the guard cells , causing water to diffuse out of them into the subsequent epidermis cells via osmosis . The turgor pressure of guard cells decreases , causing them to become . Consequently stomata .