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The mature embryo sac was one with five nucleus, i. e. , egg apparatus and two-nucleus central cell. 成熟的胚囊是五核胚囊：由近珠孔端的卵細胞和兩個助細胞以及兩個中央極核細胞構(gòu)成的。
There ware two cell proembryo and some endosperm free nucleuses in the embryo sac 7-8 days after pollination; 授粉后7-8天，在胚囊中見到二細胞原胚及數(shù)個胚乳游離核。
When pollen tubearrives at ovary and enters embryo sac by de- generated synergid, two sperm cells are released into the cell. 花粉管到達子房，通過退化助細胞進入胚囊，釋放出兩個精細胞。