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Journal of Cell Science, Vol 97, 157-165, Copyright © 1990 by Company of Biologists
Submitted on December 27, 1989
Accepted on June 13, 1990
1 Department of Botany, University of British Columbia, Vancouver, BC, Canada V6T 2B1
Endocytosis was demonstrated in elongating cortical and epidermal root cells of Lobelia erinus using the apoplast marker lanthanum nitrate. Lanthanum treatment produced electron-dense deposits throughout the cell wall, as well as in coated and smooth vesicles, partially coated reticula, and multivesicular bodies. This labelling pattern was observed in root cells that had been ultrarapidly frozen on a copper mirror and freeze-substituted (cryofixation) or fixed by conventional transmission electron microscope (TEM) techniques. The amount of endocytosis occurring was measured by counting the number of vesicles µm-2 in root cells at various stages of development. Endocytosis occurred most in actively elongating cells, and least in mature cells, which were no longer elongating. The relationship between endocytosis and active cell wall secretion suggests that endocytosis may be acting to remove excess plasma membrane material added during exocytosis of secretory vesicles.
Key words: endocytosis, multivesicular body, membrane recycling
Submitted on December 27, 1989
Accepted on June 13, 1990
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