Figure 5.
From: Q&A: What are strigolactones and why are they important to plants and soil microbes?
Simplified biosynthetic pathway from β-carotene to orobanchol. The steps from β-carotene to carlactone are believed to require only three enzymes: one isomerase and two carotenoid cleavage dioxygenases, all of which are found in the plastid. The subsequent conversion to strigolactones such as orobanchol is less well understood but apparently occurs outside the plastid and requires a cytochrome P450 enzyme.