this treatment
separates
the different stages
of embryos
development.
observers the suspension of cells with a binocular microscope or an inverted microscope.
if 'old' callus which has lost the ability to undergo embryogenesis in not available, younger culture (12 weeks after the isolation of the carrot explants) can be form embryos on ........ , but not on ....., . therefore only the treatments in part B of Fig. 7.2 will provide clear cut results.