Sesquiterpene Synthase

Sesquiterpene synthase (STS) refers to a class of enzymes that catalyze the formation of sesquiterpenes—15-carbon volatile compounds—from farnesyl pyrophosphate precursors in cannabis and other plants. These enzymes are foundational to the biosynthetic pathways that produce compounds commonly associated with earthy, woody, spicy, and herbal aromatic profiles in cannabis cultivars. Sesquiterpene synthase activity varies significantly across strains and is influenced by genetic background, developmental stage, and environmental conditions. Understanding STS function is central to breeding programs focused on terpene diversity, as different STS variants can direct precursor molecules toward distinct sesquiterpene end-products including β-caryophyllene, β-humulene, and α-bisabolol.

Breeders working with sesquiterpene-dominant phenotypes often select for plants exhibiting elevated STS expression to enhance specific aroma families and create consistent chemotypes. Analysis of sesquiterpene synthase gene expression and activity helps inform targeted crosses aimed at amplifying woody, spicy, or herbal character while maintaining metabolic balance across the full terpene profile.