In CAM plants, malic acid accumulates at night, releasing H+ ions exchanged for K+, leading to turgidity and stomatal opening; starch accumulates during the day. This allows C4 pathway activity at night and C3 during the day, with PEP regenerated from starch.
Brief description of CAM: malic acid accumulates during the night, dissociation of malic acid causes release of hydrogen ions, hydrogen ions are exchanged with potassium ions, endosmosis causes turgidity and opening of stomata. starch accumulated during the day. thus C4 pathway occurs during the night and C3 pathway during the day. phosphoenolpyruvic acid regenerated during the night from starch.
| Front | comment on the effect of temperature on the light and dark reaction |
|---|---|
| Back | dark reaction being enzymatic is temperature controlled light reaction is affected to a much lesser extent |
Tags: neet-biology::unit-4::photosynthesis
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