Vernon I. Cheadle

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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)
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)
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