Phytocannabinoids

Phytocannabinoids are naturally occurring cannabinoid compounds synthesized by cannabis plants through enzymatic pathways in trichomes and floral tissue. The primary phytocannabinoids—THC, CBD, CBG, CBC, and CBN—arise from a common precursor, cannabigerolic acid (CBGA), which decarboxylates or enzymatically converts into specific cannabinoid acids before decarboxylation. Over 100+ identified phytocannabinoids exist across cultivars, though their concentrations and ratios vary significantly based on genetics, growing conditions, and harvest timing. Breeders classify cannabis chemotypes largely by their phytocannabinoid profiles: THC-dominant, CBD-dominant, balanced, or minor-cannabinoid-rich. Understanding phytocannabinoid biosynthesis is essential to modern breeding, as it underpins trait selection, chemotype stability, and predictable phenotype expression across generations.

Breeders use phytocannabinoid profiles as primary selection markers to stabilize desired chemotypes and develop cultivars with consistent ratios. Knowledge of the CBGA synthase and CBDA/THCA synthase gene variants allows targeted crosses to isolate or combine specific cannabinoid traits and minor-cannabinoid phenotypes.