Light harvesting

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Light harvesting and Carbon fixation in
photosynthesis a brief review
Graphics are from a web site for a course by Bill
Grimes and Rick Hallick http//www.blc.arizona.e
du/courses/181gh/rick/photosynthesis/default.html
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chloroplast
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Enzymes and chlorophyll are imbedded in the
thylakoid membranes
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Energy from the excited state can be transferred
to 1. Chlorophyll fluorescence 2. Heat (
non photochemical quenching) 3. Photosynthesis
( photochemical quenching)
of chlorophyll
of chlorophyll
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The first step of photochemical electron
transport (photochemical quenching)
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Thylakoid membrane in the dark
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thylakoid membrane in the light
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• Equations for Calvin-Benson Cycle
• RUBISCO is the only CO2 fixing enzyme
• ribulose bisphosphate carboxylase oxygenase
• 6 CO2 are fixed per glucose synthesized
• Remainder of reactions used to synthesize
  glucose and regenerate RuBP

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