- companion cell
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Bot.any of a number of specialized parenchymal cells adjacent to a sieve tube in the phloem of flowering plants, believed to regulate the flow of nutrients through the tube.[1885-90]
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Universalium. 2010.
companion cell
Look at other dictionaries:
companion cell — noun : one of the elongated parenchyma cells lying next to and supposedly associated physiologically with the sieve tube in many seed plants, developing with the sieve tube from the same mother cell, sometimes extending the full length of the… … Useful english dictionary
companion cell — noun Date: 1887 a living nucleated cell that is closely associated in origin, position, and probably function with a cell making up part of a sieve tube of a vascular plant … New Collegiate Dictionary
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companion cell — A living cell associated with the sieve cell of phloem tissue in vascular plants … Glossary of Biotechnology
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companion cell — /kəmˌpænjən ˈsɛl/ (say kuhm.panyuhn sel) noun Botany a cell associated with a sieve tube and, collectively, forming one of the elements of phloem …
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Plant cell — Plant cells are eukaryotic cells that differ in several key respects from the cells of other eukaryotic organisms. Their distinctive features include: * A large central vacuole, a sap filled volume enclosed by a membrane known as the tonoplast JA … Wikipedia
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