In the second part of this research, addressed to the study of
expression of the THCA synthase gene by reverse-transcriptase RT-
PCR, the RNA of 12 cannabis samples (from CS7 to CE18) was
investigated using theRubisco gene and the 26S ribosomalRNAgene
as internal control genes for constant expression. The results did not
show a definite correlation between the chemical concentration of
THC and THCA synthase gene expression, even if the samples with
the highest percentage of THC also showed increased relative
expression; on the other hand, for similar classes of Cannabis
samples, the expression of the THCA synthase have shown a
correlationwiththe analysedpart andwiththematurityoftheplant.