Lecture+14+-+Carbon+Reactions+-2

Lecture+14+-+Carbon+Reactions+-2 - Alternative carbon...

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1 Alternative carbon fixation pathways - Calvin cycle C3 pathway - Photorespiration C2 oxidative photosynthetic carbon cycle 8.2 The Calvin cycle proceeds in three stages: carboxylation, reduction, and regeneration Photorespiration is a wasteful process - Considerable amount of the carbon fixed by photosynthesis is released as CO 2 - A major problem for many plants growing in dry locations - Plants in arid areas have developed alternative mechanisms
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2 8.9 The cyanobacterial CO 2 -concentrating mechanism CO 2 concentration mechanisms help to reduce Photorespiration Plants uses two major mechanisms In both mechanisms CO 2 is fixed twice - Spatial separation of 1 st CO 2 fixation from the Calvin cycle - Temporal separation of 1 st CO 2 fixation from the Calvin cycle In both mechanisms CO 2 is fixed twice - PEP (C-3 compound) is the acceptor molecule - First product is a C-4 compound CH2 COO - C-OPO 3 2- --------------------------------- CH 2 COO - C=O COO - PEP carboxylase CO 2 PEP Oxaloacetic acid
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Lecture+14+-+Carbon+Reactions+-2 - Alternative carbon...

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