The cell wall-plasmalemma interface in sieve tubes of barley |
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Authors: | Ray F. Evert Robert J. Mierzwa |
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Affiliation: | (1) Department of Botany, University of Wisconsin, 53706 Madison, WI, USA;(2) Department of Plant Pathology, University of Wisconsin, 53706 Madison, WI, USA |
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Abstract: | Both thick- and thin-walled sieve tubes in leaf-blade veins of Hordeum vulgare L. exhibit a distinct, electron-opaque inner wall layer after fixation in glutaraldehyde-osmium tetroxide and staining with uranyl acetate and lead citrate. This inner wall layer is thickest at the sieve plates and lateral sieve areas where it is permeated by a labyrinth of tubules formed by the plasmalemma. Along the lateral walls between sieve areas the inner wall layer apparently is penetrated by numerous microvilli-like evaginations of the plasmalemma, giving the cell wall-plasmalemma interface the appearance of a brush border. It is suggested that a similar brush-border-like structure may occur at the cell wall-plasmalemma interface of sieve elements in a wide variety of vascular plants.Abbreviation ER endoplasmic reticulum |
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Keywords: | Brush border Cell wall Hordeum (cell wall-plasmalemma interface) Leaf veins Plasmalemma Sieve tubes |
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