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gametophyte (gÉmÄËtÉfÄªtË) [ key ], phase of plant life cycles in which the gametes, i.e., egg and sperm, are produced. The gametophyte is haploid, that is, each cell contains a single complete set of chromosomes, and arises from the germination of a haploid spore.
The female gametophyte, the megagametophyte, that participates in double fertilization in angiosperms is sometimes called the embryo sac. This develops within an ovule, enclosed by the ovary at the base of a carpel.Surrounding the megagametophyte are (one or) two integuments, which form an opening called the micropyle.he ovary, surrounding the ovules, develops into the fruit, which protects the seeds and may function to disperse them. The two central cell maternal nuclei (polar nuclei) that contribute to the endosperm, arise by mitosis from the same single meiotic product that gave rise to the egg.