What are microsporogenesis and megasporogenesis?
It is the process of formation of microspore from PMC (Pollen Mother Cells).
- As development occurs in the anther, the sporogenous tissue undergoes meiosis to form microspore tetrad.
Each cell of sporogenous tissue has capacity to give rise to a tetrad. Hence, each cell is a potential pollen or PMC.
As the anther matures, the microspores get detached from each other and develop into pollen grains.
- Megasporogenesis is the process of formation of megaspores in the angiosperms.
The megaspore mother cell (MMC) gets converted into megaspores by the process of megasporogenesis.
The MMC is large and contains a dense cytoplasm and a prominent nucleus. It undergoes meiosis to produce four megaspores.
In most flowering plants, only one megaspore is functional while the other three degenerate.
The single functional megaspore develops into the female gametophyte.
microsporogenesis:-The formation of microspores inside the microsporangia (or pollen sacs) of seed plants. A diploid cell in the microsporangium, called a microsporocyte or a pollen mother cell, undergoes meiosis and gives rise to four haploid microspores. Each microspore then develops into a pollen grain (the microgametophyte)
megasporogenesis:-The formation of megaspores inside the ovules of seed plants. A diploid cell in the ovule, called a megasporocyte or a megaspore mother cell, undergoes meiosis and gives rise to four haploid megaspores. In most plants, only one of the megaspores then goes on to develop into a megagametophyte within the ovule, while the other three disintegrate. In the ovules of angiosperms, megasporogenesis takes place within a structure called a nucellus, and it is the megaspore farthest from the micropyle of the ovary that survives.