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- secondary endosperm nucleus 次级胚乳核
- The other male gamete fuses with the secondary nucleus, forming the primary endosperm nucleus. 另一个雄配子和次生核结合形成初生胚乳核。
- Primary endosperm nucleus and the degenerating antipodal cells;8. 7.;初生胚乳核和开始退化的反足细胞;
- The pollen grain germinates on a special extension of the carpel, the stigma, and double fertilization results in a diploid zygote and triploid (usually) endosperm nucleus. 花粉粒在柱头上萌发,双受精导致双倍体的合子和三倍体的胚乳形成。
- The majority embryo of seeds aborted at earlier stage could develop to earlier globular embryo phase due to the abnormal endosperm nucleus division. 与正常杂种相比,早期败育型杂种的初生胚乳核分裂出现异常,多数胚最终只能发育至球形早期;
- The development of the endosperm is of nuclear type.The division of primary endosperm nucleus is prior to that of zygote. 胚乳的发育属于核型,初生胚孔核的分裂远远早于受精卵的分裂。
- Double fertilization The fusion of one pollen nucleus with the egg to form the zygote and of the other pollen nucleus with a polar nucleus to form the triploid endosperm nucleus. 双受精:指花粉粒中的一个精子与胚珠中的卵细胞结合形成受精卵,另一个精核与极核结合形成三倍体的胚乳核。
- The endosperm development follows the Nuclear type and includes three successive stages, which are free endosperm nucleus stage, cellularization stage and mature stage. 胚乳发育类型为核型,包括游离核阶段、细胞化阶段和生长成熟阶段。
- The primary endosperm nucleus division was often prior to zygote, and it divided quickly.The endosperm cells surrounding the embryo were disintegrated during the development of embryo. 初生胚乳核先于合子分裂,胚乳细胞分裂较快,胚周围的胚乳细胞有降解现象。
- The development of endosperm was of Nuclear type.The primary endosperm nucleus division was often posterior to zygote, and its division speed was also slower than that of embryo cells. 胚乳发育属核型,初生胚乳核常常晚于合子分裂,胚乳核的分裂速度慢于胚体细胞的分裂速度。
- One fuses with the egg cell to form a zygote while the other either degenerates or, in certain angiosperms, fuses with the polar nuclei to give the primary endosperm nucleus. 一个与卵细胞结合形成受精卵,另一个要么退化,要么在某些被子植物中与极核结合形成初生胚乳核。
- several divisions of primary endosperm nucleus 初生胚乳核的几次分裂
- 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. 胚乳通常是三倍体,由初生胚乳核发育而来,三倍体核来源于花粉管中的雄配子与胚囊中两个极核的融合。
- The fortress was the nucleus of the ancient city. 这城堡是这座古城的中心。
- Her age is of secondary interest. 她的年龄不太重要。
- In secondary school, children get more advanced knowledge. 在中学,孩子获得更深一些的知识。
- A secondary matter; a side issue. 次要的第二位的事; 较次要的问题
- The protoplasm outside the nucleus of a cell. 细胞质,细胞浆细胞分子外部的细胞质
- A secondary mine passageway between two main shafts or tunnels. 次要矿山甬道矿井中连接两条大隧道的小巷道
- The government introduced universal secondary education years ago. 几年前,政府就倡导普及中等教育。