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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.
In the first reaction of the Calvin cycle, three molecules of CO2 combine with three RuBP- five-carbon molecules- with the aid of the enzyme Rubisco (ribulose biphosphate carboxylase). The resulting six-carbon molecules immediately break down into 6 molecules of PGA.