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Chapter 19: The Light Reactions of Photosynthesis

A Fast Run Through Plants. Chapter 19: The Light Reactions of Photosynthesis. Each Year 10 10 tons of carbon fixed 10 17 kcal free energy. The Light Reactions. Chlorophyll  =100,000 M -1 cm -1. Two Chloroplast Photosystems. Overview animation of Photosynthesis. PS II.

uriel-bradshaw
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Chapter 19: The Light Reactions of Photosynthesis

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  1. A Fast Run Through Plants Chapter 19: The Light Reactions of Photosynthesis

  2. Each Year 1010 tons of carbon fixed 1017 kcal free energy

  3. The Light Reactions

  4. Chlorophyll =100,000 M-1 cm-1

  5. Two Chloroplast Photosystems Overview animation of Photosynthesis

  6. PS II Read this Tutorial of PSII

  7. PS II See Animation of PSII

  8. Oxidizing Water! Each photon “pulls off” an electron

  9. PS II- generates H+ gradient too (Jagendorf,1966)

  10. Cyt bf complex: a lot like cyt.c-Q oxidoreductase

  11. PS I Read this Tutorial of PSI

  12. PS I

  13. Know the “Z” Scheme ! Overview animation of Photosynthesis

  14. ENERGETICS In chloroplasts pH= 3.5 So, G= - 4.8 kcal /mol H+ and there are ~4 H+/ ATP DG = 2.3 RT (pHthylakoid- pHstroma) + FDY(out relative to in) Overall Photosynthesis gives: 8 photons = 1O2, 2 NADPH, 3 ATP ( a 700 nm photon has -40.9 kcal /mole potentially)

  15. Cyclic Photophosphorylation: for ATP, only when NADPH is high!

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