The multifunctionalcytochromeP450monooxygenases P450-1 and P450-2 from Fusarium fujikuroi catalyze the formation of GA14 and GA4, respectively, in the gibberellin (GA)-biosynthetic pathway. However, the activity of these enzymes is qualitatively and quantitatively different in mutants lacking the NADPH:cytochromeP450 oxidoreductase (CPR) compared to CPR-containing strains. 3beta-Hydroxylation,