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- In second stage, after 2-nucleate embryo sac development, most pollen tubes grow radially around ovules. (2)沿子房徑向生長階段,二核胚囊之後,花粉管在胚珠之間穿梭,以徑向生長為主;
- In third stage, at maturing of the embryo sac, pollen tubes grow directionally toward micropyle into embryo sac. (3)朝珠孔定向生長階段,胚囊成熟時,花粉管朝珠孔定向生長進入胚囊。
- But whenthe pollen tubes reach the embryo sac, the egg apparatus has degenerated already and therehave been several free nuclei of Lhe endosperm in the central cell. 這種現象是花椒和野花椒在長期進化過程中形成的一種十分特化的適應。
- The endosperm is usually triploid and develops from the primary endosperm nucleus, the triploid nucleus resulting from the fusion of one of the male gametes from the pollen tube with the polar nuclei in the embryo sac. 胚乳通常是三倍體,由初生胚乳核發育而來,三倍體核來源於花粉管中的雄配子與胚囊中兩個極核的融合。
- Both polygonum type and panicum type embryo sac have embellum. 有性生殖和無孢子生殖的胚囊中均有胚珠附器存在;
- Abnormal development was observed at tetrad and mature embryo sac. 在四分體和成熟胚囊時期觀察到了異常發育現象。
- Genesis of megaspore and development of embryo sac in Carica papaya L. 番木瓜的大孢子發生與胚囊發育。
- These abnormalities would cause the abnormal structure of mature embryo sac. 這些異常可能最終導致多種結構異常成熟胚囊的形成。
- While in the Angiophyta the female gametophyte is simply the EMBRYO SAC. 被子植物門的雌配子體為簡單的胚囊;
- The development of embryo sac in Prunus americana Marsh var. is often abnormal. 雞心李(Prunus americana Marsh var.;)
- The chalazal end megaspore develops into the embryo sac mother cell. 合點端大孢子發育為胚囊母細胞。
- With embryo sac haustorium in chalazal end,the embryo sac is Endymion type. 胚囊發育類型為英地百合型 ,合點端形成胚囊吸器。
- Embryo sac elongated at 1-nucleate stage by fusion of small vacuoles. 功能大孢子時期核糖體密集, 線粒體和質體分裂以增加數目;
- The central portion of an ovule in which the embryo sac develops; the megasporangium. 珠心胚珠的中心,胚芽囊在此發育;大孢子囊
- Enclosure of the nucellus by the integuments is incomplete, the embryo sac or, in gymnosperms, to the archegonium. 珠被並不是將珠心完全封閉,而是留有珠孔以便受精時花粉管進入胚囊,或裸子植物的藏卵器。
- Starch grains present in the embryo sac and placenta are utilized by the embryo. 存在於胚囊和胎座中的澱粉粒為胚胎所利用。
- The central portion of an ovule in which the embryo sac develops;the megasporangium. 珠心胚珠的中心,胚芽囊在此發育;大孢子囊
- CYTOLOGICAL OBSERVATIONS ON EMBRYO SAC AND FERTILIZATION IN PRUNUS AMERICANA MARSH VAR. 雞心李胚囊及受精的觀察
- Function megaspore is in the chalaza and the monosporic embryo sac is chenopodiad type. 功能大孢子位於合點端,大孢子發育為蓼型胚囊。
- Synergid cells Two haploid cells located near the egg cell at the micropylar end of the embryo sac in flowering plants. 助細胞:存在於開花植物胚囊內,是位於珠孔端的卵細胞兩側的兩個單倍體細胞。