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The process whose specific outcome is the progression of the pollen grain over time, from its formation as the microspore to the mature structure. The process whose specific outcome is the progression of the pollen grain over time, from its formation to the mature structure. The process begins with the meiosis of the microsporocyte to form four haploid microspores. The nucleus of each microspore then divides by mitosis to form a two-celled organism, the pollen grain, that contains a tube cell as well as a smaller generative cell. The pollen grain is surrounded by an elaborate cell wall. In some species, the generative cell immediately divides again to give a pair of sperm cells. In most flowering plants, however this division takes place later, in the tube that develops when a pollen grain germinates. The process by which the microsporocyte undergoes meiosis, giving rise to four haploid microspores. The process whose specific outcome is the progression of the gametophyte over time, from its formation to the mature structure. The gametophyte is the gamete-producing individual or phase in the life cycle having alternation of generations. An example of this process is found in Arabidopsis thaliana. The final stages of microgametogenesis after the trinucleate stage has been reached resulting in viable pollen grains. The biological process whose specific outcome is the progression of a multicellular organism over time from an initial condition (e.g. a zygote or a young adult) to a later condition (e.g. a multicellular animal or an aged adult). The formation of reticulate pollen wall pattern consisting of two layers, exine and intine.

View Gene Ontology (GO) Term

GO TERM SUMMARY

Name: pollen development
Acc: GO:0009555
Aspect: Biological Process
Desc: The process whose specific outcome is the progression of the pollen grain over time, from its formation to the mature structure. The process begins with the meiosis of the microsporocyte to form four haploid microspores. The nucleus of each microspore then divides by mitosis to form a two-celled organism, the pollen grain, that contains a tube cell as well as a smaller generative cell. The pollen grain is surrounded by an elaborate cell wall. In some species, the generative cell immediately divides again to give a pair of sperm cells. In most flowering plants, however this division takes place later, in the tube that develops when a pollen grain germinates.
Synonyms:
  • GO:0048231
  • male gametophyte development
  • formation of generative and vegetative cells
  • pollen grain formation
  • GO:0009564
  • microgametophyte development
  • male gametophyte formation
Proteins in PDR annotated with:
   This term: 86 [Search]
   Term or descendants: 143 [Search]


[geneontology.org]
INTERACTIVE GO GRAPH

GO:0009555 - pollen development (interactive image map)

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