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Companion Cells and Transfer Cells

  • H.-Dietmar Behnke
Part of the NATO Advanced Study Institutes Series book series (NSSA, volume 4)

Abstract

Phloem tissue as a whole, according to the introduction of this term by Nageli (1858), consists of sieve elements, sclerenchymatic elements and parenchymatic elements. Companion cells and transfer cells, the two cell types to be considered more in detail in the following, belong to the latter group. Parenchymatic elements of phloem as a general term, however, comprise a wide variety of nucleate cells which are referred to as related or unrelated to the enucleate sieve elements. By definition of the phloem those are characteristic constituents in seed plants and ferns, but they are also present in the leptom of bryophytes.

Keywords

Transfer Cell Companion Cell Sieve Tube Sieve Element Minor Vein 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1975

Authors and Affiliations

  • H.-Dietmar Behnke
    • 1
  1. 1.Lehrstuhl fur ZellenlehreUniversität HeidelbergHeidelbergGermany

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