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  • 1
    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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  • 2
    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
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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