Only about 3% of all land plant species use the C4 pathway, but they dominate nearly all grasslands in the tropics, subtropics, and warm temperate zones. In the C4 cycle the first stable compound is 4 carbon compound, namely oxaloacetic acid. The initial product being a-4 carbon compound, the process is called C 4 pathway of carbon dioxide fixation. Both involve the … These plants fix CO2 into a four carbon compound (C4) called oxaloacetate. It is a process of carbon dioxide fixation. plant needs it, that C4 splits into pyruvate (C3) plus carbon dioxide, and the release of that carbon dioxide will increase its concentration. The carbon dioxide is fixed in the mesophyll cells. C4 is an efficient biochemical modification of the C3 Plants. This occurs in cells called mesophyll cells. C4 PATHWAY Reaction of Hatch & Slack cycle: Hatch & Slack cycle is completed in the chloroplasts of mesophyll cells and bundle sheath cells following reactions occur during this cycle. The cycle begins with CO 2 from the atmosphere entering mesophyll cells where it is used to generate oxaloacetate—a four-carbon molecule—from phosphoenolpyruvate (PEP). About 1500 species are a variety of dicot species, some of which form woody tissues and grow as shrubs and small trees. Oxaloacetic add is the first product in c4 pathway. Before studying the difference between C3, C4 and Cam pathway, you must know them individually. Thus helpful for better utilization of available water. Some plants, like sugar cane and corn, that grow in hot conditions, use an alternative process called the C 4 pathway to fix carbon. These pathways function in a way such that RuBisCO grabs large concentrations of carbon dioxide and prevents it from binding with oxygen. 2. Three-fourths of the C4 species are grasses and sedges of warm-temperate, subtropical, and tropical zones. In this article we will discuss about the Hatch-Slack (C4) pathway of co 2 fixation.. Figure \(\PageIndex{1}\): The C4 Pathway The C4 pathway is designed to efficiently fix CO2 at low concentrations and plants that use this pathway are known as C4 plants. C4 Photosynthesis. In c3 pathway, Phosphoglyceric acid is the first product. C4 pathway, is therefore, of adaptive advantage. C3, C4 and Cam pathway are the adaptations that permit several plant species to lessen photorespiration in them. 9.7: C4 Pathway and CAM Overview. The discovery of C 4 cycle in monocots such as sugarcane, maize and sorghum has indicated that these plants have solved the problem of photorespiration. C4 plants also include highly productive crops such as maize, sorghum, and sugar cane. On the final step, pyruvate plus ATP react to restore PEP; and recovery of PEP does cost ATP. C4 photosynthesis is a CO 2-concentrating mechanism present in about 7000 species of higher plants. C4 is the alternative pathway of Calvin cycle (C3 cycle) taking place during the dark phase of photosynthesis. 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