The production and activity of plant hormones is controlled
by the expression level of relevant genes. Accordingly, differences
in the germination of different seed cultivars are related to their
gene complement. The other important factor that can determine
the expression level of genes in specific plant tissues is their copy
number and hence their necessary concentration required for their
expression. These kinds of details can be used for the determination
of genes functioning at different plant growth stages, as well
as under stress