When the free nuclei of the endosperm were 16 or 32, the nucellarembryo initial (s) originated from the nucellar cells near the micropylar end of the embryo sac.
当胚乳游离核达到1 6或32个时，最早的珠心胚原始细胞由靠近胚囊珠孔端的珠心细胞分化形成。
2
Observation of citrus embryo development showed that in 50 days or so after pollination there was only one zygotic embryo in the embryo sac, and nucellarembryo was not yet invaded.