photosynthesis, light reaction

id: GO:0019684
name: photosynthesis, light reaction
namespace: biological_process
type: go
obsolete: False

Description: 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.

Parent Functions

GO:0006091generation of precursor metabolites and energy