Stamen

Stamens are the male reproductive organs of flowering plants. In most species, they are made up of an anther, which is where pollen grows, and a stalk-like filament, which delivers water and nutrients to the anther and positions it to help pollen spread. Male sporogenous cells differentiate and go through meiosis within the anther to create microspores, which become pollen grains, while other cell types help with pollen maturation, protection, and release. Cell division and differentiation outside of a typical meristem, the change from sporophytic to gametophytic production, and cell division adjustments to form structures that are uncommon in plant development are all part of pollen development.  

Androecium

Flowers are made up of four whorls of reproductive and non-reproductive components. These include the calyx, corolla, gynoecium, and androecium. An androecium’s unit is the stamen. The plural form of stamen is stamina or simply stamens. Multiple stamina make up an androecium, each of which is made up of two parts: the filament and the anther

Pollen production

Four microsporangia are found in a typical anther. In the anther, microsporangia form sacs or pockets (locules) (anther sacs or pollen sacs). The two separate locules on each side of an anther may merge to produce a single locule. The tapetum, a nutritive tissue layer that lines each microsporangium, includes diploid pollen mother cells at first. Meiosis occurs in these cells, resulting in haploid spores. After meiosis, the spores may remain united in a tetrad or may split. Each microspore subsequently divides mitotically to generate a pollen grain, which is an immature microgametophyte. 

For successful pollination, angiosperm pollen must be transferred to the stigma, the receptive surface of the carpel, of a suitable flower. The pollen grain (an immature microgametophyte) usually completes its development after arrival. It may create two sperm nuclei after growing a pollen tube and going through mitosis. 

Parts of stamen

Both the filament and the anther are constituents of the stamen, which are the reproductive organs of the flower. The following are some of its most important characteristics:

Filament

The filament, which is also known as the sterile section of the stamen, is the basal part of the stamen that is placed below the anther and serves as the structure that supports the anther. The majority of the time, it is narrow and cylindrical.

Even though they are typically thin and cylindrical, the filaments can become laminar, wide, and thick, with lengths ranging from extremely long to extremely short, or even completely absent.

Anther

The fertile structure of the stamen is the name given to this section of the stamen. It is attached to the filament, however, the location of the connection on the anther, as well as how it is attached, may differ.

They can be attached to the filament at its base (basifix), on its back (dorsilex), throughout its full longitudinal axis (adnate), or only at a single place (adnate), and are free to oscillate on the filament (versatile).

An anther is often comprised of two teaks, even though some anthers have been observed to be made up of single teak as well. When it has two thecae, the connective tissue between them serves as a link between them. Each teak tree has a pair of pollen sacs, which correspond to the reproductive organs of a microsporangium (a structure where spores are formed).

In most cases, there are two pollen sacks for each teak, for a total of four pollen sacks, but there could be instances in which the number of pollen sacks is larger or even less.

The function of stamen

The filament and anthers that make up a stamen are called anthers. It is the anther and filament of the stamen that have the primary responsibility for the transformation of sporogenous cells into male gametes, as well as different supportive and pollen-releasing cells, throughout the process of meiotic division. These male gametes are contained within pollen, which is also produced within the anthers and shown at the tips of the anthers. The male gametes make up half of the cells required to develop a flower seed in the female gametes.

Conclusion

Wind or pollinators, such as birds, bees, bats, butterflies, and insects, can transport pollen from the anther to the pistil, which is the female reproductive component of the flowering plant. When pollen reaches the stigma, which is the outermost section of the female reproductive organ, it begins a process that involves transporting it inside and down to the flower’s ovules, where it is converted into seeds. Stamens play an important role in the reproduction of seeds and the life cycle of angiosperms.