Computer-generated reconstruction from serial ultrathin sections showing the distribution of plastids within the egg cells of two genotypes of alfalfa. In the egg on the left, plastids (green) are positioned mostly below (toward the micropyle) the midtransverse region of the nucleus (blue) which results in the female plastids being largely sequested within the basal cell of the two-celled proembryo and not inherited. In the cell on the right, the plastids are perinuclear, thus, many female plastids become included in the apical cell of the two-celled proembryo and are inherited.
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