Question

What is the site of microsporogenesis?

Answer 1

The process of microsporogenesis takes place in anther. Densely cytoplasmic sporogenous cells, specifically microspore mother cells, develop and produce microspore tetrads (pollen grains) with the process of meiosis. This microspore tetrad later forms four individual pollen grains containing male gametes.

Complete answer:
In flowers, the male and female reproductive systems differentiate and develop with help of several hormonal and structural changes that are initiated to differentiate and cause further development. The androecium or male reproductive part consists of a whorl of stamens and the female reproductive part is represented by gynoecium.

The typical stamen consists of two parts- a long and slender stalk called filament and the terminal and generally bilobed part called anther. The lower end of the filament is attached to the thalamus or petal of the flower.

A typical angiosperm anther is bilobed (has two lobes), each having two theca (i.e. dithecous).the anther is a tetragonal (four sided structure) consisting of four microsporangia located at the corners, two in each lobe where the microsporogenesis takes place. When the anther is young, a group of compactly arranged cells called the sporogenous tissue occupies the centre of each microsporangium. When the microsporangia develop further, they become pollen sacs. These extend longitudinally all through the length of another and are packed with pollen grains.

Note: As the anthers mature and dehydrate the microspore dissociate from each other and develop into pollen grains. Inside each microsporangium several thousands of microspores or pollen grains are formed that are released into the environment with the dehiscence of another.