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Calvin cycle. The Calvin cycle (also known as Calvin-Benson cycle) is a series of biochemical reactions taking place in the chloroplasts of photosynthetic organisms. It was discovered by Melvin Calvin and Andy Benson at the University of California, Berkeley. It is one of the light-independent reactions and occurs in the stroma.
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.