Three months after germination, the plants began to blossom. On average, 72
percent of the tetraploid plants were female. Tetraploid plants in the reproductive
stage were two weeks sooner than diploid plants.
We also investigated the effect of polyploidy on biochemical parameters and
cannabinoids contents (Bagheri and Mansouri 2015 ). The obtained results were
interesting. The amount of THC increased only in mixoploid vegetative plants
(Fig.17.8). CBD content increased in mixoploid and tetraploid leaves in vegetative
stage plants. The most increase was observed in mixoploid plants. THC content
showed a significant decrease in the male and femaleflowers of tetraploid plants in
Fig. 17.4 Flowers of tetraploid (a) and diploid (b)Cannabis sativa L.(Bar = 2 mm)
Fig. 17.5 Comparison of plant height in tetraploid (a) and diploid (b) (Bar = 5 cm)
376 H. Mansouri and M. Bagheri