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How do stamens produce pollen?
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plant reproductive system
A large bumblebee (Bombus species) pollinating a teasel flower head (Dipsacus species).
Stamens produce pollen within specialized structures called anthers, which are typically located at the tip of a slender stalk known as the filament.12
The production process occurs within the anther through the following stages:
- Microspore Formation: A transverse section of an anther reveals four saclike structures called microsporangia. These contain diploid cells known as microsporocytes, which undergo meiosis to produce tetrads of haploid microspores.13
- Nutrient Support: During this development, a specialized layer of cells called the tapetum provides essential nutrients to the developing microspores.3
- Maturation: As the microspores mature into pollen grains, they develop a protective, decay-resistant outer wall composed of sporopollenin. The microspores also undergo mitotic division to form a microgametophyte, typically consisting of a tube cell and a generative cell.3
- Release: As the anther matures, the partition between adjacent microsporangia breaks down, leaving two pollen-containing sacs. The anther then releases the pollen, usually through a longitudinal rupture or small apical pores.4213