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    Electronic Resource
    Electronic Resource
    The cell wall-plasmalemma interface in sieve tubes of barley (1989)
    Springer
    Planta 177 (1989), S. 24-34 
    Details
    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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  • 2
    Electronic Resource
    Electronic Resource
    Studies onArtemisia afra Jacq.: The phloem in stem and leaf (1981)
    Springer
    Protoplasma 109 (1981), S. 217-231 
    Details
    ISSN: 1615-6102
    Keywords: Anatomy ; Artemisia ; Cell wall composition ; Compositae ; Phloem ; Sieve element
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The structure of the phloem was studied in stem and leaf ofArtemisia afra Jacq., with particular attention being given to the sieve element walls. Both primary and secondary sieve elements of stem and midvein have nacreous walls, which persist in mature cells. Histochemical tests indicated that the sieve element wall layers contained some pectin. Sieve element wall layers lack lignin. Sieve elements of the minor veins (secondary and tertiary veins) lack nacreous thickening, although their walls may be relatively thick. These walls and those of contiguous transfer cells are rich in pectic substances. Transfer cell wall ingrowths are more highly developed in tertiary than in secondary veins.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01287443
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    Paper (German National Licenses)
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