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PHOTOSYNTHESIS

PHOTOSYNTHESIS. Photoautotrophism - using light energy to synthesize organic molecules. PLANTS GREEN ALGAE (Protists) MULTICELLULAR ALGAE CYANOBACTERIA PURPLE SULFUR BACTERIA. Light Energy. 12 H O. 2. +. +. +. 6 C O. 2. Light Energy. C H O. 6. 6. 12. 6 H O. 2. +. +.

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PHOTOSYNTHESIS

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  1. PHOTOSYNTHESIS Photoautotrophism - using light energy to synthesize organic molecules. PLANTS GREEN ALGAE (Protists) MULTICELLULAR ALGAE CYANOBACTERIA PURPLE SULFUR BACTERIA

  2. Light Energy 12 H O 2 + + + 6 CO 2 Light Energy C H O 6 6 12 6 H O 2 + + CO2 H2O CH2O O2 6 O 2 PHOTOSYNTHESIS The Basic Chemical Reaction

  3. LIGHT REACTION Photophosphorylation LIGHT CHLOROPHYLL Thylakoid WATER SPLITTING Reactions H+ O O2 e- H+ gradient e- transport chain

  4. DARK REACTION Calvin-Benson Cycle Thylakoid H+ gradient e- transport chain NADPH ATP Calvin Cycle Stroma CO2 sugars

  5. LIGHT REACTION Making ATP PHOTOSYSTEMS Cluster of pigment molecules

  6. LIGHT REACTION Photosystem II Primary electron acceptor LIGHT (a photon) Reaction center chlorophyll Transfer of energy The reaction-center chlorophyll in the first stage of this process is known as P680.

  7. P680 P700 LIGHT REACTION 2e- Electron Transport Chain to Make ATP 2e- H2O + 2H+ O Light Photosystem I Light Photosystem II

  8. P700 LIGHT REACTION 2e- NADP+ Reductase NADPH Light Calvin-Benson Cycle Photosystem I

  9. light light LIGHT REACTION OVERVIEW NADPH Stroma 2H+ Photo system I Photo system II Cytochrome Complex NADP+ Reductase H2O O Thylakoid Space 2H+ + 2H+ ATP Synthase Stroma H+ ATP ADP + Pi

  10. INPUT 3 CO2 1. CARBON FIXATION 6 RuBP 6 Rubisco ATP ATP 3 6 3 P P P P P Pi P P 6 ADP 3 ADP 6 5 6 NADPH G3P 6 NADP+ 6 3. REGENRATION OF CO2 ACCEPTOR G3P 2. REDUCTION OUTPUT 1 G3P DARK REACTION Calvin-Benson Cycle

  11. Calvin-Benson Cycle OUTPUT O O P O CH2OH O OH OH OH aglucose CARBOHYDRATE SYNTHESIS 1 Glyceraldehyde-3-phosphate sucrose

  12. C4 Plants Crassulacean Acid Metabolism Mesophyll Cell CO2 CO2 PEP Carboxylase Organic Acid PEP (3C) Night (4C) ATP CO2 (3C) Bundle Sheath Cell CO2 Calvin Cycle Day Calvin Cycle sugar Vascular Tissue sugar ALTERNATIVE MECHANSISMS OF CARBON FIXATION

  13. PHOTOSYNTHESIS Final Summary • Use of Light (energy), Water and CO2 • Final Products - - Oxygen and Sugars • Light Reactions require photons, produce ATP & NADPH • Dark Reactions depend on availability of ATP & NADPH • Dark Reactions produce carbohydrate precursors

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