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companion cell

noun

, Botany.
  1. 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.


companion cell

/ kəm-pănyən /

  1. 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.


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Word History and Origins

Origin of companion cell1

First recorded in 1885–90

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