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The Dark Side of Photosynthesis In stroma In 3 stages.

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Presentation on theme: "The Dark Side of Photosynthesis In stroma In 3 stages."— Presentation transcript:

1 The Dark Side of Photosynthesis In stroma In 3 stages

2 Dark Reaction/ Calvin Cycle of Photosynthesis In stroma In 3 stages

3 Dark Reaction/ Calvin Cycle ATP NADPH CO 2 sugar uses ATP and NADPH (from light reaction) to convert CO 2 to sugar

4 Dark Reaction/ Calvin Cycle Phase 1: Carbon Fixation Phase 2: Reduction Phase 3: Regeneration of RuBP

5 We are in the STROMA

6

7 Carbon Fixation phase 1 Carbon Fixation --> X3 via. Rubisco 1)CO 2 attaches to a 5C sugar Ribulose Biphosphate (RuBP) via. Rubisco: P-C-C-C-C-C-C-P Rubisco (RuBP carboxylase) = enzyme

8 phase 1 Carbon Fixation --> X3 3 PGA 2)very unstable molecule... immediately splits to form 2 molecules of 3 PGA (carbonphosphoglycerate) P-C-C-CC-C-C-P

9 We are in the STROMA

10 phase 2 Carbon - Reduction --> X3 1) addt’l phosphate group to each 3-phosphoglycerate from ATP (from light reaction) : P-C-C-C-P forming 1, 3 biphosphoglycerate

11 We are in the STROMA

12 phase 2 C - Reduction --> (X3) G3P 2)reduced (e- gained) by NADPH (from light reaction) to make G3P P-C-C-C (stores more potential energy) (same sugar as in glycolysis)

13 We are in the STROMA

14 phase 2 Reduction --> (X3) 3)one G3P molecule exits (used later by the plant) P-C-C-C

15 We are in the STROMA

16 phase 3 Regeneration of CO 2 acceptor RuBP --> 1) series of reactions rearranges the 5 G3P molecules into 3 RuBP … using up 3 more ATP’s.

17 We are in the STROMA

18

19 For 1 G3P molecule the one that exited… (precursor to sugar) the cycle: uses 9 ATP uses 6 NADPH uses 3 CO 2

20 We are in the STROMA (6)


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