当胚发育到4—6个细胞时，在胚囊珠孔瑞的游离核之间先形成细胞壁。细胞壁的形成是以自由壁的方式从珠孔端到合点端自外向内进行。
The free cell wall formation occurs first in the micropylar end when the embryo is 4-6 celled stage, then to the chalazal end and the center.
合点端的胚乳细胞则侵入合点珠心组织，为胚进一步发育提供营养。
With the embryo development, most of the endosperm degenerated, and the cells near chalaza entered the chalaza, digested it and further nourished the embryo.
胚乳发育为核型，珠孔端胚乳细胞化，合点端保持游离核状态。
The endosperm development follows the nuclear type. The endosperm cells form at the micropylar end, and remain free nuclear phase at chalazal end.
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