Best Answer: Nicotinamide adenine dinucleotide phosphate (NADP) A phosphorylated derivative of NAD which functions as a coenzyme and is reduced to NADPH.In chloroplasts, NADP is reduced by ferredoxin-NADP+ reductase in last step of the electron chain of the light reactions of photosynthesis.The NADPH produced is then used as reducing power for the biosynthetic reactions in the Calvin cycle of photosynthesis.n chloroplasts, NADP is reduced by ferredoxin-NADP+ reductase in last step of the electron chain of the light reactions of photosynthesis. The NADPH produced is then used as reducing power for the biosynthetic reactions in the Calvin cycle of photosynthesis.