| 单词 | companion cell |
| 释义 | companion cellnoun 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 of companion cellFirst recorded in 1885–90 Words nearby companion cellcompanionable, companion animal, companion artery to sciatic nerve, companionate, companionate marriage, companion cell, companion ladder, companion piece, companion planting, companion set, companionship Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Scientific definitions for companion cellcompanion cell [ kəm-păn′yən ] 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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