Thca Synthase Enzyme

THCA synthase is the enzymatic pathway responsible for converting cannabigerolic acid (CBGA) into tetrahydrocannabinolic acid (THCA) in cannabis plants. This enzyme is expressed during flower development and is a key determinant of cannabinoid profile in cultivars. Cannabis plants with active THCA synthase expression typically accumulate higher THCA levels, while those with reduced or absent enzyme activity may produce higher CBD or other minor cannabinoids instead. The genetic regulation of this enzyme varies significantly across landraces and breeding lines, making it a central focus in cannabinoid-targeted breeding programs.

Breeders selecting for THC-dominant cultivars prioritize lines showing robust THCA synthase expression, while CBD-focused breeding often involves identifying or stabilizing plants with naturally low or non-functional enzyme variants. Molecular markers targeting THCA synthase genes have become increasingly useful in early-generation selection strategies.