Pollen Grain Development
The process of pollen grain development and formation of the male gamete involves crucial stages such as the presence of diploid microspore mother cells in the stamen, meiosis resulting in the formation of four haploid cells and tetrads, mitosis leading to the development of two haploid nuclei in each pollen grain, and the unique characteristics of pollen species with outer protective layer (Exine) and inner protective layer (Intine). After pollination, the generative nucleus divides to form the pollen tube and the generative nucleus further forms two male gametes.
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Presentation Transcript
Pollen Grain Development Formation of the Male Gamete
The Stamen is Diploid Microspore Mother Cells are found in the Anther
Meiosis 4 Haploid Cells /A Tetrad is formed Pollen Grains
Mitosis Each Pollen Grain now has two haploid nuclei (a) A Tube Nucleus (b) A Generative Nucleus
Each Species of Pollen is unique Exine = Outer Protective Layer Intine = Inner Protective Layer
Mitosis After Pollination the generative nucleus divides again The Tube nucleus forms the pollen tube The Generative Nucleus forms the 2 male Gametes
