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Because sieve elements are generally regarded as the specialized conducting cells in the phloem tissue, their structure in relation to function has been the subject of many studies and discussions. ' Both the protoplast and the walls of sieve elements have distinctive characteristics, some of which are difficult to relate to the rapid flow of materials-at… (More)
Any opinions expressed in this memoir are those of the author(s) and do not necessarily reflect the views of the National Academy of Sciences.
As may be judged from recent reviews,1' 2 the tonoplast (the vacuolar membrane) and the ectoplast (the external cytoplasmic membrane, or plasmalemma) have received far less attention than the other cytoplasmic membrane systems-the endoplasmic reticulum and the dictyosomes, or Golgi bodies-and the various cell organelles. A definite membranous boundary… (More)