Systemic Immunity

Systemic immunity in cannabis refers to the plant's whole-organism defense responses against pathogens and environmental stressors, involving mobile signaling molecules and inducible resistance pathways. This classification encompasses traits like salicylic acid (SA) signaling, jasmonic acid (JA) cascades, and induced systemic resistance (ISR)—mechanisms that allow the plant to mount coordinated defenses across tissues distant from initial infection sites. Breeders and researchers distinguish systemic immunity from localized hypersensitive responses, as systemic pathways often involve slower but longer-lasting protection. Documentation of systemic immunity traits remains limited in cannabis breeding records compared to visible morphological traits, though certain landrace lineages are noted for disease resilience patterns suggesting active systemic mechanisms. Understanding these whole-p

Breeders working toward disease-resistant cultivars increasingly consider systemic immunity markers as selection criteria, though phenotypic assessment remains challenging. Crosses between resilient landrace parents are sometimes evaluated for improved pathogen tolerance, with the assumption that systemic defense pathways contribute to field performance.