Genetic Rescue

Genetic Rescue refers to breeding strategies where breeders intentionally outcross to genetically distant or novel lineages to address accumulated homozygosity, inbreeding depression, or loss of vigor in an established strain line. This practice is common in cannabis cultivation programs seeking to restore phenotypic range, disease resistance, or fertility after multiple generations of closed-population selection. The term reflects deliberate genetic diversification rather than accidental outcrossing. Breeders working in this category often document parental pedigree carefully to track heterozygosity gains and trait reintroduction. Genetic rescue differs from line-crossing in its explicit focus on restoring population health rather than combining specific dominant traits.

Breeders employ genetic rescue when select lines show declining seed set, reduced phenotypic stability, or narrowed trait expression. Introducing unrelated or semi-related germplasm can restore fertility and expand the genetic basis for future trait selection.