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ONTOLOGY REPORT - ANNOTATIONS


Term:pollen development
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Accession:GO:0009555 term browser browse the term
Definition: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:exact_synonym: formation of generative and vegetative cells;   male gametophyte development;   male gametophyte formation;   microgametophyte development;   pollen grain formation
 alt_id: GO:0009564;   GO:0048231



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Term paths to the root
Path 1
Term Annotations click to browse term
  biological_process 20091
    multicellular organismal process 8961
      multicellular organism development 5238
        gametophyte development 0
          pollen development 0
            microgametogenesis + 0
            microsporogenesis 0
            pollen maturation 0
            pollen wall assembly + 0
Path 2
Term Annotations click to browse term
  biological_process 20091
    developmental process 7027
      anatomical structure development 6464
        multicellular organism development 5238
          gametophyte development 0
            pollen development 0
              microgametogenesis + 0
              microsporogenesis 0
              pollen maturation 0
              pollen wall assembly + 0
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