Cannabinoid Biosynthesis Pathways

Cannabinoid biosynthesis pathways describe the enzymatic routes through which cannabis plants convert precursor molecules into cannabinoids like THC, CBD, and CBG. These pathways are governed by gene expression, environmental conditions, and the activity of key enzymes including CBDA synthase and CBCA synthase. Understanding these metabolic routes is foundational to cannabis genetics, as they determine the cannabinoid profile of any cultivar. Breeders and researchers study biosynthetic efficiency and enzyme variants to predict and stabilize cannabinoid ratios across generations. The timing and expression of these pathways varies significantly across cultivars and phenotypes, reflecting both genetic inheritance and developmental factors.

Breeders use knowledge of cannabinoid biosynthesis pathways to select parents with desired enzymatic capacity and cannabinoid ratios. Marker-assisted selection and phenotypic screening targeting biosynthetic enzyme activity help stabilize high-CBD, high-THC, or balanced cultivars in breeding programs.