The phloem pathway



When the sieve element was discovered in the bark of woody plants a transporting function was proposed for these chains of long pipe-like cells [53]. Exudation of sap from cuts made in the bark of trees was found to contain up to 33% sugars and also small amounts of minerals and nitrogenous substances. The role of the phloem as a conducting tissue was apparently established.


Companion Cell Sieve Tube Sieve Element Sieve Plate Phloem Exudate 
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  1. Canny, M.J. (1973), Phloem Translocation, Cambridge University Press, London. Contains useful information on specific mass transfer and of the authors’ views on the translocation mechanism.Google Scholar
  2. Crafts, A. S. and Crisp, C.E. (1971), Phloem Transport in Plants, Freeman, San Francisco. A detailed account of the phloem and of translocation, with a strong bias towards pressure flow as the transport mechanism.Google Scholar
  3. Peel, A.J. (1974), Transport of Nutrients in Plants, Butterworths, London. Concentrates on phloem transport. Gives a detailed historical development of studies on mechanism, with a useful survey of aphid utilization.Google Scholar
  4. Wooding, F.P.B. (1971), Phloem, Oxford Biology Readers, Oxford University Press. A short concise account of phloem structure and function.Google Scholar

Copyright information

© D.A. Baker 1978

Authors and Affiliations

  1. 1.Reader in Plant PhysiologyUniversity of SussexUK

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