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AEBI 210- Oct 5th.doc
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Department
Biology (Agric & Envir Sc)
Course
AEBI 210
Professor
Jaswinder Singh
Semester
Fall

Description
Organisms 1- AEBI-210 001 October 5th, 2012 C4 and CAM Photosynthesis C4 Pathway: Photorespiration can drain up to 50% of the CO2 fixed on a hot, dry day An alternative carbon fixing pathway has developed to avoid this C4 reactions occur in the mesophyll The C4 pathway is found in many grasses, and plants adapted to hot, dry conditions Leaves of C4 plants have ‘wreaths’ of mesophyll cells surrounding vascular bundles -The choroplasts of the bundle sheath have no grana thylakoids or PS2 C4 reactions use CO2 more efficiently than Rubisco (2-3 times faster than C3 reactions) C4 reactions are effective at a range of temperatures PEP carboxylase fixes CO2 (as HCO3-) into a 4 carbon oxaloacetate Oxaloacetate is converted to malate or aspartate Malate or aspartate is decarboxylated releasing CO2 and pyruvate Th
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