megagametophyte

Thân thiện

A botanist examines a megagametophyte under a microscope.

Definition

Noun: - The female gametophyte: In heterosporous plants (plants that produce two distinct spore types), the megagametophyte is the multicellular, haploid (containing one set of chromosomes) structure that develops from a megaspore. It is the structure that produces the female gametes (egg cells).

Usage

The term is used specifically in botany and plant biology to describe the female reproductive structure within the ovule of seed plants and some other vascular plants. - In flowering plants, the megagametophyte is also called the embryo sac. - The development of the megagametophyte is a critical stage in the plant life cycle.

Advanced Usage

• Developmental Context: The term is used to describe a specific phase in the alternation of generations in plants, contrasting with the microgametophyte (the male gametophyte).
  • The megagametophyte nourishes the developing embryo after fertilization.

Variants and Related Words

• Megaspore (noun): The larger spore that gives rise to the megagametophyte.
• Microgametophyte (noun): The male gametophyte, which develops from a microspore and produces sperm cells.
• Gametophyte (noun): The general term for the haploid, gamete-producing phase in the life cycle of plants and algae.

Synonyms

• Female gametophyte: This is a direct descriptive synonym.
• Embryo sac: Specifically refers to the megagametophyte in flowering plants (angiosperms).

Học thuật

Noun

1. the female gametophyte produced by the megaspore of a plant that produces both microspore and megaspores