During the day the stomates are closed and. Night is cooler and not as dry which means that less water will evaporate from the plant. CAM plants open their stomates for gas exchange at night and store carbon dioxide in the form of an organic acid. Cacti lose less water by only opening their stomata at night. Plants lose a lot of water when they open their stomata to get carbon dioxide for photosynthesis, especially in hot, dry deserts. The cacti survive off this water during dry periods without rain.Д¬acti live for months without water because they need very small amounts of water to do photosynthesis. But since there is no sunlight to provided the energy for photosynthesis, the carbon dioxide is stored as an organic acid for use the next day. Their stomates open at night to take in carbon dioxide. In fact, some saguaro cacti can hold up to 2,000 pounds (907 kilograms) of water. CAM plants keep their stomates (pores) closed during the hot day to prevent water loss via evapotranspiration. The daytime CO 2 fixation, consequences a direct Calvin-cycle (C 3-photosynthesis) in addition to the assimilation of CO 2 remobilized from a nocturnally stored organic acid (Sipes & Ting, 1985). They can go through terminal oxidation and yield CO2 and H2O. Whereas C 3 photosynthesis produces a three-carbon (3-C) molecule for carbon fixation during the day, CAM generates a four-carbon organic acid from carbon fixation at night. In CAM cycling CO 2 fixation occurs in the daytime but at the same time, some nocturnal synthesis of organic acid fed by respiratory CO 2 also occurs. The inside of a cactus is like a sponge, so it can hold a ton of water. Organic acids are the result of incomplete oxidation of photosynthetic assimilates. When it rains in the desert, cacti quickly take in large amounts of water through their roots. Cacti photosynthesize in the epidermis which is why the whole plant looks green. Unlike the leaves of trees that photosynthesize, the spines have become hard and sharp for protection from animals. Instead, the spines on a cactus are their leaves. In a nutshell, 24-hour CAM occurs by phosphoenol pyruvate (PEP) carboxylase fixing CO2(HCO3 ) over the night to form malic acid that is stored in plant. Succulents usually do not have normal leaves like trees. energy with CO2 from the air, CAM plants take in CO2 at night and store it in the form of a four-carbon acid called malate. Epidermis comes from two words: вЂњepiвЂќ means covering and вЂњdermisвЂќ means skin. There is also a very thick, waxy epidermis covering the outside of the plant.

Succulents have a sponge-like interior that stores a lot of water. Fixation of CO2 in mesophyll with a 3-C molecule of phosphoenolpyruvate (PEP) to form a 4-C organic acid, such as malic acid (the enzyme that does this is PEP. Image by Miwasatoshi.Д¬acti (plural for cactus) are a type of succulent plant. Saguaro are well adapted to survive through long, dry, hot summer seasons.

Carbon stored as organic acid cam