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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. The process by which the megasporocyte undergoes meiosis, giving rise to four haploid megaspores in the nucellus. Progression through the phases of the meiotic cell cycle, in which canonically a cell replicates to produce four offspring with half the chromosomal content of the progenitor cell. The process whose specific outcome is the progression of the spore over time, from its formation to the mature structure. The spore gives rise to gametophytes. The process whose specific outcome is the progression of the gametophyte over time, from its formation to the mature structure. The gametophyte is the gamete-producing individual or phase in the life cycle having alternation of generations. An example of this process is found in Arabidopsis thaliana. A biological process whose specific outcome is the progression of a cell over time from an initial condition to a later condition.

View Gene Ontology (GO) Term

GO TERM SUMMARY
Name: megasporogenesis
Acc: GO:0009554
Aspect: Biological Process
Desc: The process by which the megasporocyte undergoes meiosis, giving rise to four haploid megaspores in the nucellus.
Synonyms:
  • meiosis of the megasporocyte
  • meiotic division of the megasporocyte
  • megaspore development
  • megaspore mother cell meiosis
Proteins in PDR annotated with:
   This term: 2 [Search]
   Term or descendants: 2 [Search]


[geneontology.org]
INTERACTIVE GO GRAPH

GO:0009554 - megasporogenesis (interactive image map)
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