part of generation of precursor metabolites and energy photosynthesis photosynthesis, light reaction https://github.com/geneontology/go-ontology/issues/31634 biological_process MetaCyc:PWY2PN3-7 Wikipedia:Photolysis#Photolysis_in_photosynthesis GO:0019684 photolysis The light reactions of photosynthesis, which take place in photosystems II and I. Light energy is harvested and used to power the transfer of electrons among a series of electron donors and acceptors. The final electron acceptor is NADP+, which is reduced to NADPH. NADPH generated from light reactions is used in sugar synthesis in dark reactions. Light reactions also generate a proton motive force across the thylakoid membrane, and the proton gradient is used to synthesize ATP. There are two chemical reactions involved in the light reactions: water oxidation in photosystem II, and NADP reduction in photosystem I. MetaCyc:PWY-101