cO Photosynthesis PRIMARY CARBON METABOLISM Erythrose-4-phosphate 3-Phosphoglycerate Phosphoenolpyruvate Pyruvate (3-PGA) Tricarboxylic acid cycle Acetyl COA Aliphatic amino acids Shikimic acid Malonic Mevalonic pathway acid pathway Lacid pathway MEP pathway Aromatic amino acids Nitrogen-containing secondary products Phenolic compounds Terpenes SECONDARY CARBON METABOLISM FIGURE 13. 4 A simplified view of the major pathways of secondary-metabolite Figure 5-2 biosynthesis and their interrelationships with primary metabolismFigure 5-2