Figure 2 - The gibberellin biosynthetic pathway.

(a) Fungi and plants convert the carbon skeleton ent-kaurene to gibberellic acid 3 (GA₃) by a different series of oxidative transformations, thus showing that these pathways are evolutionarily convergent. Fungal transformations are shown in red and plant transformations are shown in blue. (b) The 15 most abundant gibberellin-family metabolites isolated from a culture of Fusarium fujikuroi⁷. Those with a known biological activity are shown in red.