megasporogenesis

American  

[meg-uh-spawr-uh-jen-uh-sis, -spohr-] / ˌmɛg əˌspɔr əˈdʒɛn ə sɪs, -ˈspoʊr- /

noun

Botany.

1. the formation and development of megaspores.

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megasporogenesis Scientific  

/ mĕg′ə-spôr′ə-jĕn′ĭ-sĭs /

1. The formation of megaspores inside the ovules of seed plants. A diploid cell in the ovule, called a megasporocyte or a megaspore mother cell, undergoes meiosis and gives rise to four haploid megaspores. In most plants, only one of the megaspores then goes on to develop into a megagametophyte within the ovule, while the other three disintegrate. In the ovules of angiosperms, megasporogenesis takes place within a structure called a nucellus, and it is the megaspore farthest from the micropyle of the ovary that survives.

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Usage

What does megasporogenesis mean? Megasporogenesis is the process by which megaspores are formed in the ovule of a seed plant. This megaspore goes on to become part of the ovule (the “egg”) in the plant’s reproduction. Spores are reproductive parts of an organism, especially those of plants and fungi. Megasporogenesis is similar to microsporogenesis, which produces much smaller pollen grains. The combination of pollen with an ovule results in reproduction.

Example Sentences

First, in the process of megasporogenesis, a single cell in the diploid megasporangium—an area of tissue in the ovules—undergoes meiosis to produce four megaspores, only one of which survives.

From Textbooks • Jan. 1, 2015