In contrast to the zygotic embryos the level of
ABA in the SE in all the growth stages determined
was extremely low (Fig. 5). Depending upon the
developmental stage of the SE the concentration
of ABA ranged between 0.005 and 0.011 mg g1
FW (Fig. 5) being the highest at the final growth
stage (late cotyledonary and beginning of embryo
conversion to plantlets). In addition to such extreme
differences in the concentration of ABA, SE
also differed from their zygotic counterparts in
that almost no changes and no peak appearance in
the concentration of ABA took place along with
SE development.