What Is the Role of NADP in Photosynthesis?

The role of nicotinamide adenine, or NADP, is to act as an electron carrier during the light dependent stages of photosynthesis. During the interaction, the electrons change NADP from its oxidized state – NADP+ – to its reduced state – NADPH.

The light dependent reactions are the first of the two stages of photosynthesis and take place on the membranes of the thylakoids as chlorophyll a or other photosynthetic pigment is excited by a photon and the water molecule is split into oxygen, hydrogen ions and free electrons. After the reaction, NADPH remains in the stroma and can be used to convert CO2 to sugars.