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  • 1
    Electronic Resource
    Electronic Resource
    The suberin lamella, a possible barrier to water movement from the veins to the mesophyll ofThemeda triandra forsk (1982)
    Springer
    Protoplasma 112 (1982), S. 1-8 
    Details
    ISSN: 1615-6102
    Keywords: Apoplastic Barrier ; Bundle sheath ; Grass leaf anatomy ; Prussian blue ; Suberin lamella ; Themeda
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Precipitation of ferrous ions by ferricyanide in transpiring leaves ofThemeda triandra Forsk. produced crystalline deposits, which were visible with the light and electron microscope. Prussian blue crystals were formed within the lumina of the tracheary elements and the apoplast, or cell wall continuum of the vascular tissues and bundle-sheath cells. Little if any deposition was noted within the lignified secondary thickenings of the tracheary elements. The localization pattern suggests that the ferrous ions moved from the lumina of the tracheary elements via the exposed primary walls. Prussian blue crystals were abundant in the outer tangential and radial walls of the bundle-sheath cells. By contrast, crystals were lacking in the walls of neighbouring mesophyll cells, suggesting that the suberin lamella in the bundle-sheath walls effectively inhibited the apoplastic movement of ferrous ions and possibly may impede, or restrict the movement of water across the bundle-sheath/mesophyll interface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01280209
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  • 2
    Electronic Resource
    Electronic Resource
    Free-space marker studies on the leaf ofZea mays L. (1985)
    Springer
    Protoplasma 126 (1985), S. 62-73 
    Details
    ISSN: 1615-6102
    Keywords: Zea mays ; Free-space markers ; Grass leaf anatomy ; Lanthanum ; Prussian blue ; Suberin lamella
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Two free-space marker procedures (Prussian blue and lanthanum nitrate) were employed to determine the pathway(s) followed by water and solutes in the transpiration stream after their introduction into the xylem of small and intermediate bundles, and the effectiveness of the suberin lamellae of the bundle-sheath cells as a barrier to the movement of tracer ions (Fe3+ and La3+). Judged from the distribution of Prussian-blue crystals (insoluble, crystalline deposits resulting from the precipitation of ferric ions by ferrocyanide anions) and lanthanum deposits, water and the tracer ions moved readily from the lumina of the vessels into the apoplast (cell wall continuum) of the phloem and bundle-sheath cells via portions of vessel primary walls not bearing lignified secondary wall thickenings. Prussian blue and lanthanum deposits were abundant on the bundlesheath cell side of the bundle sheath/mesophyll interface but few occurred on that of the mesophyll, indicating that the suberin lamella is an effective barrier to apoplastic movement of both ferric and lanthanum ions. The presence of Prussian-blue crystals and lanthanum deposits in the compound middle lamella of the radial wall of the bundle-sheath cells indicates that the compound middle lamella provides an apoplastic pathway for transpirational water from the xylem to the evaporating surfaces of the mesophyll and epidermal cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01287674
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    Paper (German National Licenses)
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