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C3 Photosynthesis. Plants which use only the Calvin cycle for fixing the carbon dioxide from the air are known as C3 plants. In the first step of the cycle CO 2 reacts with RuBP to produce two 3-carbon molecules of 3-phosphoglyceric acid (3-PGA).his loss to the system is why C3 plants will outperform C4 plants if there is a lot of water and sun. The C4 plants make some of that energy back in the fact that the rubisco is optimally used and the plant has to spend less energy synthesizing rubisco.
Both C3 and C4 cycles operate in the non-light-requiring or Dark Reactions of photosynthesis but spatially, that is, in different cells: C4 in the mesophyll cells immediately followed by C3 cycle in the bundle sheath cells. CO2 first enters the leaf and into the mesophyll cell.his enzyme initially fixes atmospheric CO2 in the mesophyll cells which is then delivered to the bundle sheath cells in the form of organic acids. The C4 cycle in C4 photosynthesis therefore serves as a CO2-concentrating mechanism for the bundle sheath cells.