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embryo sac development definition: The process whose specific outcome is the progression of the embryo sac over time, from its formation to the mature structure. The process begins with the meiosis of the megasporocyte to form four haploid megaspores. Three of the megaspores disintegrate, and the fourth undergoes mitosis giving rise to a binucleate syncytial embryo sac. The two haploid nuclei migrate to the opposite poles of the embryo sac and then undergo two rounds of mitosis generating four haploid nuclei at each pole. One nucleus from each set of four migrates to the center of the cell. Cellularization occurs, resulting in an eight-nucleate seven-celled structure. This structure contains two synergid cells and an egg cell at the micropylar end, and three antipodal cells at the other end. A binucleate endosperm mother cell is formed at the center. The two polar nuclei fuse resulting in a mononucleate diploid endosperm mother cell. The three antipodal cells degenerate. [GOC:mtg_plant, GOC:tb]
cellularization of the embryo sac definition: The process by which the eight-nucleate single celled female gametophyte develops into the seven-celled female gametophyte. This mature structure contains two synergid cells and an egg cell at the micropylar end, and three antipodal cells at the other end. A binucleate endosperm mother cell is formed at the center. [GOC:jic, GOC:mtg_plant, GOC:mtg_sensu, ISBN:047186840X]
embryo sac central cell differentiation definition: The process whereby the two uncellularized polar nuclei cellularize, fuse and acquire the specialized features of a mononucleate diploid central cell. [GOC:jic, GOC:mtg_plant]
regulation of embryo sac central cell differentiation definition: Any process that modulates the frequency, rate or extent of female gametophyte central cell differentiation. [GOC:go_curators, GOC:mtg_plant]
negative regulation of embryo sac central cell differentiation definition: Any process that stops, prevents or reduces the frequency, rate or extent of embryo sac central cell differentiation. [GOC:go_curators, GOC:mtg_plant]
positive regulation of embryo sac central cell differentiation definition: Any process that activates or increases the frequency, rate or extent of embryo sac central cell differentiation. [GOC:go_curators, GOC:mtg_plant]
embryo sac egg cell differentiation definition: The process whereby an uncellularized embryo sac nucleus cellularizes and acquires the specialized features of an egg cell. [GOC:jic, GOC:mtg_plant, GOC:mtg_sensu]
regulation of embryo sac egg cell differentiation definition: Any process that modulates the frequency, rate or extent of embryo sac egg cell differentiation. [GOC:go_curators, GOC:mtg_plant]
negative regulation of embryo sac egg cell differentiation definition: Any process that stops, prevents or reduces the frequency, rate or extent of embryo sac egg cell differentiation. [GOC:go_curators, GOC:mtg_plant]
positive regulation of embryo sac egg cell differentiation definition: Any process that activates or increases the frequency, rate or extent of embryo sac egg cell differentiation. [GOC:go_curators, GOC:mtg_plant]
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