Tetraploidy

Tetraploidy refers to plants possessing four complete sets of chromosomes (4n) rather than the typical two sets (2n) found in diploid cannabis. This chromosomal condition occurs naturally in some cannabis populations and can be induced through breeding techniques or chemical treatment with colchicine. Tetraploid cannabis plants often display larger flowers, thicker stems, and increased resin production compared to their diploid counterparts. Breeders working with polyploid cannabis have documented morphological shifts and altered terpene profiles in resulting offspring, though individual expression varies significantly. The trait is relevant to breeding programs focused on vigor enhancement and trait amplification rather than terpene production specifically.

Tetraploid induction serves as a chromosomal engineering tool in cannabis breeding to explore hybrid vigor, sterility barriers, and phenotypic expression. Breeders occasionally cross tetraploid and diploid plants to generate triploid (3n) offspring, which may exhibit reduced fertility—a trait relevant to seedless cultivation programs.