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  • 1
    Digitale Medien
    Digitale Medien
    Exudation-reabsorption in a mycorrhizal fungus, the dynamic interface for interaction with soil and soil microorganisms (1999)
    Springer
    Mycorrhiza 9 (1999), S. 137-144 
    Details
    ISSN: 1432-1890
    Schlagwort(e): Key word Exudation ; Reabsorption ; Mycelium-soil interface ; Osmotic gradient pump ; Carbon and water translocation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract  The mycelium of Suillus bovinus slowly absorbed [U-14C]glucose and other tracers from droplets placed on the cords, translocated them to the peripheral hyphae and exuded them into fluid drops on the hyphal tips. The exudate was characterized by 1H NMR spectroscopy and by sugar and amino acid analysis. The exuded compounds were mainly carbohydrates and peptides. Acetic acid and oxalic acid were also present in the exudate along with a number of unidentified compounds. Released ions (K, Na, Cl, P, Mg and Ca) were identified by X-ray microanalysis. The mycelium was shown to reabsorb up to 65% of the exuded 14C compounds in 2 days. Glucose, mannitol, glutamic acid (pH 3.2), and Rb+ (as well as other mineral ions) were all readily absorbed by the mycelium, while oxalic acid at pH 4.2 and glutamic acid at pH 6.5 were not. Exudation of fluid droplets on the surface of the hydrophobic mycorrhizal fungus S. bovinus may represent an ecophysiologically important function of the extramatrical hyphae, which provides an interface for interaction with the immediate hyphal environment and its other microorganisms where the peripheral hyphae exchange their photosynthetically derived products for nutrients to be used later by the pine host. We hypothesize that actively absorbed carbohydrates from the root are translocated to the peripheral hyphae along a concentration gradient of sugars and polyols by means of active translocation and diffusion in cell elements and by acropetal water transport in the cord vessels.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s005720050298
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    In-situ identification of major metabolites in the red alga Gracilariopsis lemaneiformis using high-resolution magic angle spinning nuclear magnetic resonance spectroscopy (1998)
    Springer
    Planta 206 (1998), S. 300-307 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Key words: Digeneaside ; Floridoside ; Gracilariopsis ; High-resolution magic angle spinning ; Isethionic acid ; Isofloridoside
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract. The content of low-molecular-weight compounds in the red alga Gracilariopsis lemaneiformis [(Bory) Dawson, Acleto, et Foldvik] has been analysed in-situ using high-resolution magic angle spinning (HR-MAS) nuclear magnetic resonance (NMR) spectroscopy. The major heteroside was shown to be floridoside, but digeneaside and isofloridoside were also detected in the alga. Other major components were isethionic acid and the amino acids taurine and citrulline. The results from the HR-MAS NMR analysis were confirmed with high-resolution NMR spectroscopy, high-resolution fast atom bombardment mass spectrometry (FABMS) and GC-MS, on material isolated from the studied alga, but also on authentic samples.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s004250050404
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Glycoalkaloids of Solanum commersonii Dun. ex Poir (1997)
    Springer
    Euphytica 95 (1997), S. 195-201 
    Details
    ISSN: 1573-5060
    Schlagwort(e): Solanum ; tomatine ; commersonine ; demissine ; dehydrocommersonine ; dehydrodemissine
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract Five glycoalkaloids were identified from the aerial parts of wild Solanum commersonii Dun. ex Poir growing in Uruguay and their structures elucidated mainly by chemical and spectroscopic methods. In addition to the already known commersonine, demissine, tomatine and dehydrocommersonine, a new glycoalkaloid, identified as δ5-demissine, solanid -5-en-3-O- {β-D-Glcp-(1→2)-[β-D-Xylp-(1→3) ]β-D-Glcp-(1→4)-β-D-Galp } was found. Tomatine and dehydrocommersonine have not been reported earlier as components of this plant. The glycoalkaloid composition found in the wild plants studied differ significatively from those described earlier, and have some implications in taxonomy and its use in potato breeding.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1002997616784
    Standort Signatur Einschränkungen Verfügbarkeit
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