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  • Discuss the process of development of a 3-celled pollen grain from microspore mother cell with the help of labelled diagram  

Discuss the process of development of a 3-celled pollen grain from microspore mother cell with the help of labelled diagram

 

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Pollen grain (male gametophyte) 

The pollen grains represent the first cell of male gametophytes. A pollen grain has a two-layered wall namely,  (a) Exine  (b) Intine. The exine is the hard outer layer which is made up of sporopollenin while Intine is the inner, thin, and continuous layer which is made up of cellulose and Pectin. 

A mature pollen grain contains two cells namely, the Vegetative cell and the Generative cell  Vegetative cell is a bigger cell having abundant food reserve and a large irregularly shaped nucleus while the Generative cell is a small spindle-shaped cell with dense cytoplasm and a nucleus that floats in the cytoplasm of the vegetative cell. 

The pollen grains are shed at the 2-celled stage in Flowering Plants. ln other plants, the generative cell divides by mitosis to give rise to the two male Sometimes before pollen grains are shed in the 3-celled stage. Once they are shed, pollen grains have to land on the stigma before they lose viability.

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Irshad Anwar

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