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 . 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.
KeywordsCompanion Cell Sieve Tube Sieve Element Sieve Plate Phloem Exudate
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- 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
- 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
- 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
- Wooding, F.P.B. (1971), Phloem, Oxford Biology Readers, Oxford University Press. A short concise account of phloem structure and function.Google Scholar