All nucellar cells disappear, when an embryo sac is ripe.
属薄珠心，胚囊形成时珠心细胞全部消失。
Embryo sac lies on the top of nucellar. Nucellar tissuesunder ovule form nucellar colum.
胚囊位于珠心顶部，胚囊下方得珠心组织形成珠心柱。
The nucellar embryo suspensor, its development passed through the similar stages of the zygotic embryo.
珠心胚发育经历与合子胚相同得发育阶段。
At the mature embryo sac stage, some nucellar cells at the chalazal region differentiated into hypostase.
成熟胚囊期, 合点端部分珠心细胞特化为承珠盘。
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