ISSN:
1432-2048
Keywords:
Brush border
;
Cell wall
;
Hordeum (cell wall-plasmalemma interface)
;
Leaf veins
;
Plasmalemma
;
Sieve tubes
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00392151
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