GA Biosynthetic and Catabolic Pathways in Plants.
This is a simplified diagram only showing the pathways for the synthesis of non-13-hydroxylated GAs. Gray text indicates GA synthetic and catabolic enzymes catalyzing corresponding steps. GGDP, geranylgeranyl diphosphate; CDP, ent-copalyl diphosphate; CPS, ent-copalyl diphosphate synthase; KS, ent-kaurene synthase; KO, ent-kaurene oxidase; KAO, ent-kaurenoic acid oxidase.