Synthase Gene Expression

Synthase gene expression refers to the genetic regulation of enzymes that synthesize terpenes and cannabinoids in cannabis flowers and leaves. These genes control the production of terpene synthases—proteins responsible for converting precursor molecules into volatile aromatic compounds. Understanding synthase expression is central to cannabis breeding, as it directly influences the chemical diversity and aroma profiles observed across different cultivars. Expression levels vary based on genetics, environmental stress, light exposure, and developmental stage, making this trait both heritable and phenotypically plastic. Breeders studying synthase gene activity can predict and select for specific terpene-dominant phenotypes without relying solely on chemotype testing.

Breeders leverage synthase gene expression data to stabilize desired aroma profiles across generations and to breed for consistency in terpene ratios. Lines with high limonene synthase or myrcene synthase expression are often selected to develop cultivars with distinctive citrus or earthy characteristics.