Microsporogenesis: Microsporogenesis is the process of formation of pollen grains (or microspores) inside the pollen sacs (or microsporangium) of flowering plants by meiotic or reduction division. Each microspore is the first cell of the male gametophyte that produces male gametes.

Structure of Microsporogenesis

• The stamen, which has a bilobed anther connected to the filament, is the flower’s male reproductive organ.

• Each of the anther’s two lobes, which are bifurcated, contains two pollen sacs or microsporangia.

• Numerous pollen grains can be found inside the microsporangia.

• A bilobed anther’s pollen sacs or microsporangia appear to be located at the anther’s four corners. As a result, angiosperm anthers are tetrasporangiate.

• A connective tissue that houses the vascular bundle that transports nutrients connects the two lobes of the anther.

• The exterior wall and the central homogenous sporogenous tissue make up each microsporangium (or pollen sac).

• The epidermis (common anther covering), endothecium, 1-3 layer thick middle layers, and innermost tapetum are the four different types of layers that make up the Microsporangium wall.

• The endothecium, intermediate layers, and epidermis all serve as barriers of defence. The endothecium aids in the release of pollen grains during the ripe anther’s dehiscence.

• At maturity, the central layer starts to deteriorate.

• The developing pollen grains are fed by the tapetum, which is the innermost wall layer. The thick cytoplasm and many nuclei are characteristic of tapetum cells.

• Sporogenous cells, also known as microsporocytes, are tightly packed together at the microsporangium’s centre. A microsporocyte has a large nucleus and lots of cytoplasms.

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By Team Learning Mantras