. Explain Filament and Attachment of filament to the Anther


Best Answer

Lower thread like stalk of stamen is called filament.

Characteristic of Anther

1.Upper knob like part of stamen is called anther.

2.Anther is called dithecous when it has two lobes.

3.Anther is called monothecous when it has single lobe.  e.g. Malvaceae family.

4.Reduced or nonfunctional stamens are called staminodes.  e.g. Salvia, Verbaseum.

5.There are two pollen chambers in each lobe of anther, hence dithecous anther is also called tetrasporangeate and monothecous anther is called bisporangiate.

7.When face of anther is towards centre of flower it is called introse.  e.g. Tomato.

8.When face of the anther is towards periphery it is called extrose.  e.g. Ranunculus.

Attachment of filament to the Anther

There are four ways of attachments 

i)Adnate

The filament runs along the back of the anther e.g. Michelia.

ii)Basifixed or Innate

The filament is attached to the base of anther. e.g. Datura

iii)Dorsifixed

The filament is attached to the anther on dorsal side. e.g. Hibiscus.

iv)Versatile

The filament is attached to the anther at its dorsal side at very minute points so that anther is able to swing freely.  e.g.  Wheat and grasses.

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