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Photosynthetic metabolism in maize leaves. The oxaloacetate (OAA) formed by PEPC (1) in the mesophyll is either reduced to malate or transaminated to Asp. Whereas malate is decarboxylated to pyruvate by NADP-ME (2) in the chloroplasts of the BS cells, oxaloacetate formed from Asp in the mitochondria is decarboxylated to PEP by PEPCK (3) in the cytosol of the BS cells. The CO2 produced in the decarboxylation reactions is subsequently fixed by Rubisco (4). PGA, Phosphoglycerate.
