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companion cell
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companion cell
noun Botany.
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.
Origin:
1885–90
1885–90
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
Cite This Source
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Link To companion cell
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Companion cell
is always a great word to know.
So is eukaryotic organism. Does it mean:
| organism that has a nucleus containing genetic material |
| organism capable of self-nourishment which uses photosynthesis or chemosynthesis for energy |
American Heritage
Science Dictionary
companion cell  (kəm-pān'yən) Pronunciation Key
A specialized parenchyma cell, located in the phloem of flowering plants and closely associated with the development and function of a sieve-tube element. Companion cells probably provide ATP, proteins, and other substances to the sieve-tube elements, whose cytoplasm lacks many structures necessary for cell maintenance. |
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
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