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Aperture (botany)

 

 
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Aperture (botany)
 
 
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Apertures are very small spots on the walls of a pollen
Pollen

Pollen is a fine to coarse powder consisting of Gametophyte , which produce the male gametes of spermatophyta. A hard coat covering the pollen grain protects the sperm cells during the process of their movement between the stamens of the flower to the pistil of the next flower....
, where the wall is thinner and/or softer. For germination it is necessary that the pollen tube
Pollen tube

The pollen tube of most seed plants acts as a conduit to transport sperm cells from the pollen grain, either from the stigma to the ovules at the base of the pistil, or directly through ovule tissue in some gymnosperms ....
 can reach out from the inner of the pollen and transport the chromosome
Chromosome

A chromosome is an organized structure of DNA and protein that is found in Cell . A chromosome is a single piece of DNA that contains many genes, regulatory sequence and other genetic sequence....
s to the egg deep down in the pistil. The apertures are the places where the pollen tube is able to brake through the elsewhere very tough pollen wall.

The number and configuration of apertures are often very exactly defined for and characteristic for different groups of plants.






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Apertures are very small spots on the walls of a pollen
Pollen

Pollen is a fine to coarse powder consisting of Gametophyte , which produce the male gametes of spermatophyta. A hard coat covering the pollen grain protects the sperm cells during the process of their movement between the stamens of the flower to the pistil of the next flower....
, where the wall is thinner and/or softer. For germination it is necessary that the pollen tube
Pollen tube

The pollen tube of most seed plants acts as a conduit to transport sperm cells from the pollen grain, either from the stigma to the ovules at the base of the pistil, or directly through ovule tissue in some gymnosperms ....
 can reach out from the inner of the pollen and transport the chromosome
Chromosome

A chromosome is an organized structure of DNA and protein that is found in Cell . A chromosome is a single piece of DNA that contains many genes, regulatory sequence and other genetic sequence....
s to the egg deep down in the pistil. The apertures are the places where the pollen tube is able to brake through the elsewhere very tough pollen wall.

The number and configuration of apertures are often very exactly defined for and characteristic for different groups of plants. The biggest class of plant species, Eudicotyledonae
Eudicots

Eudicots and Eudicotyledons are terms introduced by Doyle & Hotton to refer to a group of flowering plants that had been called "tricolpates" or "non-Magnoliid dicots" by previous authors....
 has three apertures in each pollen.

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