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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.
3-PGA is a three-carbon sugar-phosphate. This fact means that the Calvin cycle is sometimes called C-3 photosynthesis too...the product of carbon fixation is a 3-carbon molecule. Next, the 3-PGA is energized and reduced by ATP and NADPH from the light reactions. This phase is labeled a reduction phase.hat is obvious from that is the connection to the light reactions. The Calvin cycle needs NADPH and ATP from the light reactions. Thus the Calvin cycle is inseparable from the light reactions...they only occur in the light! This is why dark reactions is a poor name for the Calvin cycle.