Abstract
When William Harvey was studying the circulation of blood in mammals three and a half centuries ago, his work was aided by his being able to separate arteries and veins both because of their appearance and their manner of function. Plant physiologists are not so fortunate in that their long distance phloem and xylem vessels are very intimately connected. They are also minute and usually protected by other tissues which makes their isolation in the living state difficult. Nonetheless the analogy between conductivity in plants and in animals leads one to suppose that there could be advantages in using isolated sieve tubes or other conducting tissue if the isolation could be performed without damage to the functioning tissue itself. In most cases, for example in trees, the difficulty of isolating phloem from xylem in small discrete bundles without killing the tissue in the process is enormous compared to isolation of arteries and veins in animals. However, the very close proximity of phloem and xylem in most of the higher plants which makes separation difficult seems not only to be a part of the morphological development of the two tissues, but also seems to indicate a functional feed-back relationship between the two.
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Fensom, D.S. (1975). Work with Isolated Phloem Strands. In: Zimmermann, M.H., Milburn, J.A. (eds) Transport in Plants I. Encyclopedia of Plant Physiology, vol 1. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-66161-7_9
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DOI: https://doi.org/10.1007/978-3-642-66161-7_9
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