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A structure lying external to one or more cells, which provides structural support for cells or tissues; may be completely external to the cell (as in animals) or be part of the cell (as in plants). The outer layer of the pollen grain wall which is composed primarily of sporopollenin. The outer, sculptured layer of the exine, which lies above the nexine. Any constituent part of the extracellular matrix, the structure lying external to one or more cells, which provides structural support for cells or tissues; may be completely external to the cell (as in animals) or be part of the cell (as often seen in plants). Any constituent part of the extracellular region, the space external to the outermost structure of a cell. For cells without external protective or external encapsulating structures this refers to space outside of the plasma membrane. This term covers constituent parts of the host cell environment outside an intracellular parasite. A rod-like element of the sexine and ectexine, supporting either the tectum (the layer of sexine which forms a roof over the columella), or supporting a caput (an architectural element on top of a columella).

View Gene Ontology (GO) Term

GO TERM SUMMARY
Name: columella
Acc: GO:0043674
Aspect: Cellular Component
Desc: A rod-like element of the sexine and ectexine, supporting either the tectum (the layer of sexine which forms a roof over the columella), or supporting a caput (an architectural element on top of a columella).
Synonyms:
  • sexine 1
Proteins in PDR annotated with:
   This term: 2 [Search]
   Term or descendants: 2 [Search]


[geneontology.org]
INTERACTIVE GO GRAPH

GO:0043674 - columella (interactive image map)
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