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  • 1
    Electronic Resource
    Electronic Resource
    Plasmatubules: an alternative to transfer cells? (1982)
    Springer
    Planta 156 (1982), S. 461-465 
    Details
    ISSN: 1432-2048
    Keywords: Apoplast ; Hordeum (plasmatubules) ; Plasmalemmasome ; Plasmatubule ; Symplast ; Transfer cell
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Tubular evaginations of the plasmalemma of the scutellar epithelial cells of barley are described. The evaginations are similar to those present at other sites where solute flux occurs for a limited period only and wall development of the transfer-cell form has not occured. Differential uptake of the fluorescent dyes fluorescein, which moves into the symplast, and 8-anilino-1-naphthalene sulphonic acid, which remains in the apoplast only, indicates that the scutellar epithelial cells contain the boundary between the apoplast and symplast. We suggest that i) the plasmalemma evaginations, which have a specific form and localisation, may be referred to as plasmatubules rather than by the general term plasmalemmasome, and that ii) the plasmatubules may act in membrane amplification in a short-term structural modification which is an alternative to transfer cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00393318
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Plasmatubules in transfer cells of pea (Pisum sativum L.) (1985)
    Springer
    Planta 165 (1985), S. 191-196 
    Details
    ISSN: 1432-2048
    Keywords: Apoplast ; Plasmatubule ; Pisum (plasmatubules) ; Symplast ; Transfer cell ; Vein (minor)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Plasmatubules are tubular evaginations of the plasmalemma. They have previously been found at sites where high solute flux between apoplast and symplast occurs for a short period and where wall proliferations of the transfer cell type have not been developed (Harris et al. 1982, Planta 156, 461–465). In this paper we describe the distribution of plasmatubules in transfer cells of the leaf minor veins of Pisum sativum L. Transfer cells are found in these veins associated both with phloem sieve elements and with xylem vessels. Plasmatubules were found, in both types of transfer cell and it is suggested that the specific distribution of the plasmatubules may reflect further membrane amplification within the transfer cell for uptake of solute from apoplast into symplast.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00395041
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Plasmatubules: fact or artefact? (1985)
    Springer
    Planta 165 (1985), S. 185-190 
    Details
    ISSN: 1432-2048
    Keywords: Hordeum (scutellum, plasmatubule) ; Plasmatubule ; Scutellum (plasmatubule)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Plasmatubules are tubular evaginations of the plasmalemma associated with sites where high solute flux occurs between apoplast and symplast. Plasmatubules of the scutellar epithelial cells of germinating barley (Hordeum vulgare L.) have been examined following a variety of fixation methods. Of the aqueous fixations, primary aldehyde fixation with osmium post-fixation and osmium as the primary fixative gave comparable images, whilst potassium permanganate resulted in some distortion of the tissue in general including dilation of the tubular evaginations of the plasmalemma. Freeze-fixation and substitution with acetone and acetone-osmium gave images of the plasmalemma comparable to those obtained by the aqueous aldehyde and osmium methods. The similarity of structure with aldehyde or osmium and freezing as the primary fixation is taken to indicate that plasmatubules are real and not artefacts resulting from the fixation procedure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00395040
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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