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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.
The path of CO2 from air, to initial fixation in mesophyll cells, to release in bundle sheath cells and entry into the Calvin-Benson Cycle is shown in the following diagram: C4 photosynthesis is an adaptation for plants living in hot, arid climates like Tucson, Arizona.C4 plants initially fix CO2 in mesophyll cells as 4-carbon compounds, and later release CO2 in bundle sheath cells. There is an additional ATP requirement for each carbon dioxide utilized in this pathway.ome plants that live in hot, dry climates maintain low oxygen levels in their leaves by keeping the stomata closed to prevent water loss. To get adequate CO2 for photosynthesis, C4 plants have adapted to photorespiration by modifying the Calvin-Benson cycle.