Reduction. In the second stage of the Calvin cycle, the 3-PGA molecules created through carbon fixation are converted into molecules of a simple sugar – glyceraldehyde-3 phosphate (G3P). This stage uses energy from ATP and NADPH created in the light-dependent reactions of photosynthesi
Chemical energy is stored in ATP, and NADPH is transferred to 3-PGA to form the high energy molecule glyceraldehyde 3-phosphate (G3P). G3P is used to make sugar.
