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巨峰葡萄子房２室，每室具２个胚珠。胚珠倒生，具两层珠被，胚珠发育属厚珠心型。大孢子母细胞减数分裂形成４个呈线形排列的大孢子。只有合点端１个大孢子发育成胚囊，单核胚囊经３次有丝分裂形成八核胚囊，成熟胚囊内具７个细胞。巨峰葡萄胚囊发育属蓼型。大孢子和雌配子体发生略迟于小孢子和雄配子体，雌雄配子体均在开花前完成发育。
Kyoho grape room 2 rooms, each with 2 ovules. Ovule inverted, with two beads, ovule is a thick bead heart-shaped. Megaspores mother cells meiosis to form four linear arrangement of megaspores. Only one megaspore at the conjunctival site developed into an embryo sac. The mononuclear embryo sac formed the octa-nucleated embryo sac by 3 mitoses and the 7 embryo sac with 7 cells. Kyoho grape embryo sac development Polygonum type. Megaspore and female gametophyte occur slightly later than microspores and male gametophyte, and both male and female gametophytes are well developed before flowering.