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Understanding Photosynthesis Light Reactions: A Detailed Summary

Explore the intricacies of photosynthesis light reactions, from chlorophyll oxidation to ATP synthesis via chemiosmosis and electron transport chain. Learn how protons build a gradient, leading to NADPH and ATP production. Discover the essential steps involving water oxidation and electron movement through photosystems.

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Understanding Photosynthesis Light Reactions: A Detailed Summary

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  1. Photosynthesis Light Reactions Photosynthesis

  2. Light Rxns Summary via chemiosmosis ETC builds proton gradient

  3. Light Rxns • PS II drops e- through ETC H+ Stroma II ETC e- Thylakoid Space

  4. Light Rxns H+ Stroma II ETC e- e- H+ Thylakoid Space

  5. Light Rxns • Chlorophyll oxidizes H2O’s to replace lost e- • Protons collect in thylakoid space • O2is released Stroma II ETC e- e- e- H+ H+ H+ H+ H+ H+ Thylakoid Space

  6. Light Rxns • Chemiosmosis Stroma II ETC e- e- H+ H+ H+ H+ H+ H+ ATP Synthase Thylakoid Space ADP+P ATP

  7. Light Rxns • Photosystem I re-energizes electrons • NADP+ picks up e- (and some protons, too) Stroma II I ETC e- e- H+ H+ H+ H+ NADPH NADP+ H+ Thylakoid Space H+ ATP

  8. Light Rxns Summary H2O + Light  NADPH + O2 + ATP E + H’s E

  9. Cyclic e- Flow Produces extra ATP

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