Light-dependent reaction

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Light-dependent reactions of photosynthesis at the thylakoid membrane





The first ideas about light being used in photosynthesis were proposed by Jan Ingenhousz in 1779 [1]who recognised it was sunlight falling on plants that was required, although Joseph Priestly had noted the production of oxygen without the association with light in 1772 [2].


Then in 1939 Robin Hill showed that isolated chloroplasts would make oxygen, but not fix CO2 showing the light and dark reactions occurred in different places[4]. This lead later to the discovery of photosystem 1 and 2.

Cyclic photophosphorylation


Noncyclic photophosphorylation








  7. The NADPH is then used later in the Calvin-Benson Cycle to remove PGA that is produced from RuBisCO reaction [2] and releases enzyme for continuation of steady state reaction [3]

See also


  1. Ingenhousz, J (1779). Experiments Upon Vegetables. London: Elmsly and Payne.
  2. Priestley, J (1772). Observations on Different Kinds of Air. 62,pages=147. London: Phil. Trans. Roy. Soc.
  3. van Niel, C. B. (1931.). "On the morphology and physiology of the purple and green sulphur bacteria". Arch. Mikrobiol. 3: 1–114. Check date values in: |year= (help)
  4. Hill, R. (1939). "Oxygen Produced by Isolated Chloroplasts". Proceedings of the Royal Society of London. Series B, Biological Sciences. 127 (847): 192–210. Unknown parameter |month= ignored (help)

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