Planteome: Term Details for "companion cell" (PO:0000071)

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Term Information

Accession: PO:0000071
Name: companion cell
Ontology: plant_anatomy
Synonyms: célula acompañiante (Spanish, exact), minor vein companion cell (exact), 伴細胞 (Japanese, exact)
Alternate IDs: None
Definition: A parenchyma cell (PO:0000074) that is adjacent to a sieve tube element (PO:0000289) and arises from the same phloem mother cell (PO:0000400) as the sieve tube element. Source: PO_REF:00011
Comment: Companion cells are connected to sieve tube elements through plasmodesmata and function in phloem loading of small molecules, including photosynthate (either sucrose or raffinose-family oligosaccharides). May participate in phloem sucrose loading (GO:0009915). Molecules can be loaded into the companion cells from surrounding cells through either symplastic (via plasmodesmata) or apoplastic (transmembrane) transport. Unlike sieve tube elements, companion cells retain their nuclei and other organelles at maturity. A sieve tube element may have one or more or no companion cells associated with it. This term should not be used for other types of parenchyma cells (PO:0000074) that do not arise from the same phloem mother cell as a sieve tube element. Companion cells are found in angiosperms, as compared to albuminous cells (PO:0025412), which are found in non-angiosperm vascular plants. Companion cells may be specialized as transfer companion cells (PO:0025458), ordinary companion cells (PO:0025459), or intermediary companion cells (PO:0025460). Multiple types of companion cells may be found in the same plant.
Subset: CL; TraitNet
Related: Link to all annotated objects annotated to companion cell.; Link to all direct and indirect annotations to companion cell.; Link to all direct and indirect annotations download (limited to first 10,000) for companion cell.
Feedback: Comments, changes to terms, or requests for new ontology terms can be made at PO issue tracker on GitHub.

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BFO:0000002 continuant
BFO:0000001 entity
BFO:0000004 independent continuant
BFO:0000040 material entity
PO:0025131 plant anatomical entity
PO:0009011 plant structure
PO:0009002 plant cell
PO:0009007 portion of plant tissue
PO:0025606 native plant cell
PO:0025059 portion of ground tissue
PO:0025030 ground tissue cell
PO:0005421 parenchyma
PO:0009015 portion of vascular tissue
PO:0000074 parenchyma cell
PO:0005417 phloem
PO:0000071 companion cell
PO:0025460 intermediary companion cell
PO:0025459 ordinary companion cell
PO:0025458 transfer companion cell

Parents of companion cell (PO:0000071)

subject	relation	object
companion cell	is_a	parenchyma cell (PO:0000074)
companion cell	RO:0002220	sieve tube element (PO:0000289)
companion cell	BFO:0000050	phloem (PO:0005417)

Children of companion cell (PO:0000071)

subject	relation	object
intermediary companion cell (PO:0025460)	is_a	companion cell
transfer companion cell (PO:0025458)	is_a	companion cell
ordinary companion cell (PO:0025459)	is_a	companion cell

PO_GIT: 442