Although some people are allergic to pollen, the role pollen plays in the life cycle of a plant is nothing to sneeze at. Flowering plants, called angiosperms, produce pollen in a male floral part called the stamen, comprised of a stem-like filament and pollen-shedding pod called the anther. In non-flowering plants, called gymnosperms, pollen is made in male-gendered cones.
Flowering plants, or angiosperms, create structures to exchange genetic codes in the process of making seeds. Flowers are this specialized structure. Although flowers may have both male and female floral parts, some plant species have flowers that are single-gendered, having male or female parts in separate flowers.
The female part of the flower is known as the pistil and is generally found in the center of the flower. The pistil is comprised of stigma, the style and the ovary.
The male part of the flower is known as the stamen and usually surrounds the female pistil.
The individual male floral part is referred to as the stamen, or androecium. A stamen is made up of a thin stem called a filament and pollen-filled sacs called an anther. Often each flower has multiple stamens.
A filament is a thin, thread-like stalk of the stamen. It physically supports and carries the pollen-making anther at its tip, providing a means for water, nutrients and hormones to permit the development of the anther as the flower matures.
At the tip of the stamen's filaments is the anther, which is a single or collection of pollen sacs where pollen is created, ripened and released. A pollen grain is minute in size and is shaped uniquely per each plant species.
Each pollen grain is filled with male gametophytes of the plant. A gametophyte contains the genetic code, DNA, of the plant in one-half the amount. Once a pollen grain reaches and fertilizes the ovary of the female flower part, the two halves of the DNA code merge and form a viable seed that can later develop into a plant.
In non-flowering plants, called gymnosperms, no flowers are produced, but reproduction takes place via differently gendered cones. Cycads and conifers like pines and spruces are an example. Male cones are small, thin, cylindrical structures that spilt open to shed copious amounts of pollen. Wind carries this pollen, distributing it upon nearby female cones and subsequently fertilizing ovaries in a ripe cone.
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- What Is the Purpose of a Flower on a Plant?
- Parts of an Angiosperm Flower
- Process of Double Fertilization in Flowering Plants
- Plants That Produce Flowers