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Photosynthesis

Photosynthesis. Photosynthesis. Dark Reactions. Calvin Cycle (C 3 Pathway). 6ATP + 6NADPH + 3 RuBP + 3 CO 2  6 G3P. 3 ATP +. 5 G3P. 1 G3P Ready for cell use. Calvin Cycle. 3 – CO 2. 5C. 5C. 1C. 3 – RuBP (Ribulose Bisphophate). 3 – RuBP. 3C. 6 ATP. Rubisco. 6 - PGA.

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Photosynthesis

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  1. Photosynthesis Photosynthesis Dark Reactions

  2. Calvin Cycle (C3 Pathway) 6ATP + 6NADPH + 3 RuBP + 3 CO2 6 G3P 3 ATP + 5 G3P 1 G3P Ready for cell use

  3. Calvin Cycle 3 – CO2 5C 5C 1C 3 – RuBP (Ribulose Bisphophate) 3 – RuBP 3C 6 ATP Rubisco 6 - PGA C3 Pathway 3C 5 – G3P 6 – G3P 3 ATP 1 – G3P 6 NADPH

  4. Calvin Cycle 3 – CO2 5C 5C 1C 3 – RuBP 3 – RuBP 3C 6 ATP Rubisco 6 - PGA C3 Pathway 3C 6 – G3P 5 – G3P 3C 3 ATP 1 – G3P 2 – G3P 6 NADPH

  5. Photorespiration • In arid conditions… • stomata close • O2 builds up • CO2 is depleted • Rubiscolinks RuBP to O2 • No carbon fixation • No sugars

  6. C4 Pathway – PR Solution 1 Mesophyll Cell O2 ATP Bundle Sheath Cell Calvin Cycle Vascular Tissue CO2 • CO2 fixing enzyme has minimal O2 affinity • 4-C molecule forms (C4 Pathway) • Spatial separation of Calvin cycle (rubisco) and O2 3C 4C 3C CO2 Rubisco works here Sugar

  7. CAM Pathway – PR Solution 2 • Temporal separation of carbon fixation & Calvin cycle • Stomata open at night to collect CO2 (minimal evap.) • Fixed CO2kept until ATP & NADPH available during day

  8. Photosynthesis Review

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