FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
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Term photosynthesis, light reaction ID (Ontology) GO:0019684 (Gene Ontology)
Definition 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.[ PubMed:15746074 ]
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metabolic process
 |__generation of precursor metabolites and energy__
 |__photosynthesis__________________________________|
                                                    photosynthesis, light reaction
                                                     |__photosynthesis, light harvesting
                                                     |   |__photosynthesis, light harvesting in photosystem I
                                                     |   |__photosynthesis, light harvesting in photosystem II
                                                     |   |__photosystem II repair
                                                     |__photosynthetic electron transport chain
                                                     |   |__photosynthetic electron transport in photosystem I
                                                     |   |__photosynthetic electron transport in photosystem II
                                                     |__photosynthetic NADP+ reduction
                                                     |__photosynthetic phosphorylation
                                                     |   |__cyclic photosynthetic phosphorylation
                                                     |   |__noncyclic photosynthetic phosphorylation
                                                     |__photosystem I assembly
                                                     |__photosystem II assembly
                                                     |   |__photosystem II oxygen evolving complex assembly
                                                     |__regulation of photosynthesis, light reaction
                                                         |__negative regulation of photosynthesis, light reaction(+)
                                                         |__photosynthetic state transition
                                                         |__photosystem I stabilization
                                                         |__photosystem II stabilization
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Is a generation of precursor metabolites and energy
Part of photosynthesis
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Synonyms
  • "photolysis" RELATED
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MetaCyc:PWY-101
Wikipedia:Photolysis#Photolysis_in_photosynthesis