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Photosynthesis Chapter 10PowerPoint Presentation

Photosynthesis Chapter 10

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Chapter 10

Photosynthesis occurs in the chloroplast.

Chloroplast = type of plastid

Proplastid

Chloroplasts

Chromoplasts

Amyloplasts

When photosynthetic pigments absorb photons, four things can happen:

Photon re-emission (fluorescence)

Heat generation

Energy transfer (resonance transfer)

Photochemistry

Pigments absorb across specific wavelengths. happen:

Absorption Spectrum

Multiple pigments allow more light to be harvested.

Two types of antenna complexes with distinct reaction centers:

RC absorbs at 700 nm (PS I)

RC absorbs at 680 nm (PS II)

PS I centers: Involved with the reduction of NADPH for use in carbohydrate synthesisPS II Involved with ATP synthesis for use in carbohydrate production

Two Distinct Photosystems

Photosystems I and II centers:

Electrons come from the splitting of water. centers:H2O ½O2 + 2H+ + 2e-2H2O O2 + 4H+ + 4e-

Photosystems I and II centers:

Photosystems I and II centers:

Photophosphorylation Summary centers:PS II 4 photons ~2 ATP PS I 4 photons 2 NADPH

Photosynthesis Overview centers:

Melvin Calvin centers:

Process of CO centers:2 fixation = Calvin CycleThe Calvin cycle takes place in the chloroplast stroma.

Calvin cycle has three main parts: centers: Carboxylation Reduction Regeneration

Glyceraldehyde-3-P centers:

Ribulose-1,5-bisphosphate carboxylase/oxygenase centers:(Rubisco)1/8 - 1/4 total leaf protein

Glyceraldehyde-3-P centers:

3 Ribulose-1,5-bisphosphate + 3 CO centers:23 Ribulose-1,5-bisphosphate + Glyceraldehyde-3-phosphate

Summary

Fixation of 1 CO2 molecule requires 3 ATP + 2 NADPH

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