SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
CAM daytime photosynthesis. Illustration of the daytime mechanism for crassulacean acid metabolism (CAM) photosynthesis, used by some plants to obtain energy from sunlight. CAM plants close their gas-exchange pores (stomata) in the day. The 4-carbon compound malate, produced and stored in the mesophyll cell's vacuole (yellow) at night, is transferred in the day to the chloroplast (green). The Calvin-Benson cycle and ATP (adenosine triphosphate) energy cycles are used to produce sugars and regenerate PEP (phosphoenolpyruvate). For the night-time reaction, see image C023/8822. For this artwork with labels, see image C023/8823.
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