In photosynthetic organisms, NADPH is produced by <span>ferredoxin-NADP+ reductase</span><span> in the last step of the electron chain of the </span>light reactions<span> of </span>photosynthesis<span>. It is used as reducing power for the biosynthetic reactions in the </span>Calvin cycle<span> to assimilate carbon dioxide. It is used to help turn the carbon dioxide into glucose. It is also needed in the reduction of nitrate into ammonia for plant assimilation in </span>nitrogen cycle<span>.
