Embryonic sac - Wikipedia
In flowering plants the megasporangium is also called the nucellus, and the female gametophyte is sometimes called the embryo sac or embryonic sac. Two distinct processes are involved in producing the megagametophyte from the megaspore mother cell:
胚囊 - 百度百科
胚囊发育包括 大孢子发生 和雌 配子体 形成两个步骤。 根据 大孢子母细胞 减数分裂后参加形成胚囊的 大孢子 核数目的不同，被子植物胚囊可分成单孢、双孢和四孢胚囊3种主要类型（图2）。
Embryo Sac – Structure, Types, Development, Function
2024年9月1日 · The structure of the embryo sac, also known as the mature female gametophyte, is integral to the reproductive process in flowering plants. The embryo sac is a highly organized structure composed of seven cells and eight nuclei, each serving a specific role in fertilization and subsequent seed development.
Embryo Sac - Introduction, Structure and FAQs - Vedantu
Embryo Sac is the female gametophyte of a seed plant, consisting of a thin-walled sac within the nucellus which contains the egg nucleus and other nuclei that produce endosperm upon fertilisation. Seven cells and eight nuclei make up the mature embryo sac.
Embryo Sac - an overview | ScienceDirect Topics
The embryo sac, representing the gametophytic generation of the plant, is the result of a process which starts with the differentiation of a nucellus parenchyma cell into a megaspore mother cell. The megaspore mother cell in turn subsequently undergoes meiosis to …
Recent advances in understanding female gametophyte …
The female gametophyte (FG), called the embryo sac, produces the female gametes and usually is obscured within the maternal, sporophytic ovule ( Figure 1). Fusion of male and female gametes occurs during double fertilization, after the sperm cells are delivered to the embryo sac by the pollen tube.
Frontiers | Central Cell in Flowering Plants: Specification, Signaling ...
2020年10月21日 · Central cell as one of the key innovations of flowering plants is the biggest cell in the multicellular haploid female gametophyte (embryo sac). The embryo sac differentiates from the meiotic products through successive events of …
Poles Apart: Monosporic, Bisporic, and Tetrasporic Embryo
2020年9月14日 · A single mitotic division of the megaspore nuclei produces an eight-nucleate embryo sac. In Adoxa moschatellina, pollen tubes do not enter the embryo sac via a ‘synergid’ and embryo sacs may produce multiple embryos (Czapik, 1976). In Sambucus racemosa, multiple pollen tubes enter individual embryo sacs. The groups of cells at micropylar ...
40.3.1: Sexual Reproduction in Angiosperms - Biology LibreTexts
2021年12月17日 · During megasporogenesis, four megaspores are produced with one surviving; during megagametogenesism, the surviving megaspore undergoes mitosis to form an embryo sac (female gametophyte). The sperm, guided by the synergid cells, migrates to the ovary to complete fertilization; the diploid zygote develops into the embryo, while the fertilized ...
Embryo Sac | Journal of Embryology - Open Access Pub
The embryo sac is a specialized cell in angiosperms (flowering plants) that is responsible for the formation, nutrition, and protection of the developing embryo. It is made up of three cell types: an egg cell, two synergid cells and three antipodal cells.