Tetraploidy

Tetraploidy refers to plants with four complete sets of chromosomes (4n) instead of the typical two sets (2n) found in diploid cannabis. This chromosomal doubling occurs naturally in some populations but is also induced by breeders using colchicine treatment or tissue culture methods. Tetraploid cannabis plants often exhibit larger flowers, thicker stems, and denser foliage compared to their diploid counterparts. Breeders working in this category report increased vigor and potentially altered cannabinoid and terpene expression, though genetic expression in polyploid cannabis remains an active area of study. Tetraploidy is less common than diploid or triploid breeding programs but represents an important tool in the genetics toolkit for exploring novel plant architecture and biochemical profiles.

Breeders employ tetraploidy induction to create novel plant morphologies and potentially access different trait combinations unavailable in diploid lines. Tetraploid individuals are often crossed with diploid or triploid plants to generate triploid hybrids, which some breeders associate with altered phenotypic expression and breeding behavior.