Development of Male and Female Gametophytes: Microsporangium and Microsporogenesis

Structure of Microsporangium

The microsporangium is the structure within the anther where microspore mother cells undergo meiosis, leading to the production of microspores, which ultimately develop into pollen grains. In a transverse section, the typical microsporangium appears nearly circular in outline.

The microsporangium is surrounded by four wall layers, namely:

• Epidermis: The outermost layer providing protection.
• Endothecium: The second layer contributing …

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Development of Male and Female Gametophytes: Pollen Grains and Megasporogenesis

Pollen Grains

• A pollen grain is the male gametophyte of flowering plants, responsible for delivering the male gametes (sperm cells) to the female reproductive structures during pollination.
• Pollen grains are generally spherical, measuring about 25 - 50 micrometers in diameter. The outer layer of the pollen grain is called the exine, which is made up of sporopollenin, a highly resistant organic material. This layer provides protection and durability, enabling p…

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