Plant Defense Chemistry

Plant Defense Chemistry refers to the secondary metabolites cannabis plants produce in response to environmental stress, pathogens, and herbivory. These compounds—including cannabinoids, terpenes, and phenolic compounds—serve protective functions in the plant's ecology. Breeders studying defense chemistry examine how genetic lineages express these metabolites under cultivation conditions, as defense responses often correlate with terpene profile richness and cannabinoid diversity. Understanding defense pathways helps breeders select for plants with robust secondary metabolism. This category encompasses both induced defenses (expressed under stress) and constitutive defenses (baseline production). Lineage records frequently document defense chemistry traits as markers for vigor and environmental adaptation.

Breeders working in this category often use defense chemistry markers to select for resilient genetics and complex terpene expression. Strong defense chemistry is commonly associated with plants that maintain stable secondary metabolite profiles across growing conditions, making it valuable for breeding stable F1 and stabilized lines.