Two polar nucleis fuse into the secondarynucleus, or they dontt fuse before the anther shed.
开花前 ，两极核融合成次生核 ，或不融合仍保留极核状态。
2
The other male gamete fuses with the secondarynucleus, forming the primary endosperm nucleus.
另一个雄配子和次生核结合形成初生胚乳核。
3
The mature embryo sac is surrounded by en lothelium tapetum. It is composed or an egg apparatus, one central cell with secondarynucleus, and 1—6 antipodal cells.