CYTOLOGY OF DIFFERENTIATING TRACHEARY ELEMENTS I. ORGANELLES AND MEMBRANE SYSTEMS |
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| Authors: | K Esau V I Cheadle R H Gill |
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| Institution: | Department of Biological Sciences, University of California, Santa Barbara |
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| Abstract: | The distribution of organelles, membrane systems, and ribosomes is not at any time obviously related to the pattern of secondary wall in helically thickened tracheary elements in leaves of Beta vulgaris L. (sugar beet) and Cucurbita maxima Duchesne, fixed with potassium permanganate and osmium tetroxide. During the differentiation of the secondary wall, cisternae of the endoplasmic reticulum and dictyosomes are particularly conspicuous, and the dictyosomes are associated with numerous vesicles. Similar vesicles appear to be in various stages of fusion with the secondary wall thickenings. The tracheary elements contain plastids which may include starch granules. Ribosomes occur free in the cytoplasm and in association with endoplasmic membranes. |
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