Flowering Plant Reproduction - 10 The Angiosperm Life Cycle – Details Flowering plants have separate male and female sporangia: the megasporangia and microsporangia. Meiosis, the formation of spores, and subsequent gametophyte development occur within the sporangia. Microsporogenesis and Microgametogenesis occur sequentially within the anther. Microsporogenesis produces the microspore. Microgametogenesis is the process by which the microspore matures into the male gametophyte. Anthers typically contain four microsporangia chambers, often called pollen sacs, or locules. These chambers contain the sporogenous tissue that undergoes meiosis producing microspores. The sporogenous tissue is surrounded by a layer of nutritive tissue, the tapetum, which delimits the pollen sac. The cells that undergo meiosis are called microspore (or pollen) mother cells. Each microspore mother cell produces four haploid microspores during meiosis. Each microspore develops into a pollen grain that is the male or microgametophyte.
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