极核细胞是位于植物子房中的胚珠中，有2个，或者4个，8个。（多为2个）与植物的授粉结实有关。一朵花的子房中，有好几个卵细胞，其中最重要的两个卵细胞之一就是极核细胞。
极核细胞能自主融合成为一个次生大细胞，但未观察到融合后的细胞进一步分化。
Polar nuclei could autofused to a big secondary cell, but further differentiation of the cell was not observed.
成熟的胚囊是五核胚囊：由近珠孔端的卵细胞和两个助细胞以及两个中央极核细胞构成的。
The mature embryo sac was one with five nucleus, i. e., egg apparatus and two-nucleus central cell.
中央细胞以后的发育主要是极核的发育和极核周围胞质的变化。
Further development of the central cell mainly involved changes in the orientation of the polar nuclei and the distribution of the cytoplasm.
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