This preview shows page 1. Sign up to view the full content.
Unformatted text preview: $ $ *5' 6 C4 Pathway: CO2 fixed in 4 carbon molecule
(19 families, several thousand species, including corn, sugarcane, etc) Mesophyll cell PEP carboxylase Crassulacean Acid Metabolism (CAM)
(Succulents, bromeliads, cacti, orchids, etc) CO CO2 2 CO2 also fixed as 4 carbon molecule Oxaloacetate (4 C) Malate (4 C) BundleSheath cell Stoma PEP (3 C) ADP ATP Pyruvate (3 C)
CO2 CALVIN CYCLE Pep carboxylase has higher affinity for CO2 than does rubisco Thus, C4 pathway keeps CO2 high in bundle sheath cells and prevents rubisco from binding O2 leading to photorespiration of carbon Sugar Vascular tissue Up next - Multicellularity 7...
View Full Document
- Fall '07