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Any metabolic process by which photosynthetic organisms use light energy to convert ADP to ATP without the concomitant reduction of dioxygen (O2) to water that occurs in phosphorylation. Any process that stops, prevents or reduces the frequency, rate or extent of the light-dependent reaction of photosynthesis. The synthesis by organisms of organic chemical compounds, especially carbohydrates, from carbon dioxide (CO2) using energy obtained from light rather than from the oxidation of chemical compounds. The aggregation, arrangement and bonding together of a set of components to form a photosystem I complex on the thylakoid membrane. The process by which NADP+ is reduced to NADPH. The light reactions of photosynthesis use energy from photons to generate high-energy electrons. These electrons are used directly to reduce NADP+ to NADPH. NADPH is a relatively stable molecule and can pass on its hydrogen atom to other molecules in chemical reactions. 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. The chemical reactions and pathways resulting in the formation of precursor metabolites, substances from which energy is derived, and any process involved in the liberation of energy from these substances. Any process that modulates the frequency, rate or extent of the light-dependent reaction of photosynthesis. A process, occurring as part of photosynthesis, whereby light provides the energy for a series of electron carriers to operate together to transfer electrons and generate a transmembrane electrochemical gradient. In the photosynthetic reaction centers, primary charge separation is initiated by the excitation of a molecule followed by the transfer of an electron to an electron acceptor molecule following energy transfer from light harvesting complexes. Absorption and transfer of the energy absorbed from light photons between photosystem reaction centers. The aggregation, arrangement and bonding together of a set of components to form a photosystem II complex on thylakoid membrane. In plants, the photosystem II complex consists of over 20 polypeptides encoded by either nuclear or chloroplast genome. The chemical reactions and pathways by which individual cells transform chemical substances.

View Gene Ontology (GO) Term

GO TERM SUMMARY
Name: photosynthesis, light reaction
Acc: GO:0019684
Aspect: Biological Process
Desc: 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.
Synonyms:
  • photolysis
Proteins in PDR annotated with:
   This term: 18 [Search]
   Term or descendants: 85 [Search]


[geneontology.org]
INTERACTIVE GO GRAPH

GO:0019684 - photosynthesis, light reaction (interactive image map)
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