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Plant cell extension: structural implications for the origin of the plasma membrane
Authors:ELSIE QUAITE  R E PARKER  M W STEER
Institution:Department of Botany, The Queen's University of Belfast, Belfast BT7 INN, U.K.
Abstract:Abstract. The proposal that rapidly elongating plant cells cannot maintain plasma membrane synthesis by means of the normal endomembrane system has been examined in elongating segments of Avena sativa coleoptiles. Segments were sampled and fixed for electron microscopy, before and after elongation on auxin solutions. Mean cell extensions, cytoplasmic volumes, dictyosomc numbers, and vesicle sizes and numbers were determined. It was shown that there are sufficient dictyosomes present to sustain the vesicle production necessary for the observed plasma membrane extension.
Keywords:A vena saliva            Gramineae  oats  auxin  cell elongation  endomembrane concept  dictyosome activity  quantitative electron microscopy
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