There ware two cell proembryo and some endosperm free nucleuses in the embryo sac 7-8 days after pollination;

When electric currents (electrons) are passed through positively-charged gasses (protons and neutron nucleuses) inside bulbs.

The experiment has proved that TMV-RNA multiplied vigorously in tobacco protoplasts with cellular nucleuses, while hardly multiplied in cytoplasts separated from nucleuses.