Editing Photorespiration (section)

====CAM (Crassulacean acid metabolism)====
[[File:CAMplantgraph.jpg|class=skin-invert-image|thumb|300px|left|Overnight graph of {{CO2}} absorbed by a CAM plant]]
CAM plants, such as [[cacti]] and [[succulent plant]]s, also use the enzyme PEP carboxylase to capture carbon dioxide, but only at night. [[Crassulacean acid metabolism]] allows plants to conduct most of their gas exchange in the cooler night-time air, [[Carbon sequestration|sequestering carbon]] in 4-carbon sugars which can be released to the photosynthesizing cells during the day. This allows CAM plants to minimize water loss ([[transpiration]]) by maintaining closed stomata during the day. CAM plants usually display other water-saving characteristics, such as thick cuticles, stomata with small apertures, and typically lose around 1/3 of the amount of water per {{chem|CO|2}} fixed.<ref>{{cite book | title = Plant Physiology | edition = Fifth | publisher = Sinauer Associates, Inc. | vauthors = Taiz L, Zeiger E | date = 2010 | chapter = Chapter 8: Photosynthesis: The Carbon Reactions: Inorganic Carbon–Concentrating Mechanisms: Crassulacean Acid Metabolism (CAM) | page = 222 }}</ref>