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1992 (1)
1985 (2)
1Author    Hartwig Schulz, Gabriele Lausch, Walter FeldheimRequires cookie*
 Title    Veränderung des Tocochromanolmusters einiger Pflanzenöle (Sojabohne, Lupine, Sonnenblume und Weizen) während Keimung und Wachstum Alteration of Tocochromanol Pattern in Some Plant Oils (Soybean. Lupine. Sunflower and Wheat) during Germination and Growth  
 Abstract    Seed, sprout and plant oils from soybean (Soja hispida), lupine (Lupinus mutabilis), sunflower (Helianthus annuus) and wheat (Triticum aestivum) were assayed for their tocochromanol content and composition. High-performance liquid chromatography (HPLC) with fluorescence detection was used to determine tocopherols and tocotrienols of laboratory-extracted oils. In general, leaves of lupine, soja, and wheat with a high chlorophyll-a-content also were found to be rich of alpha-tocopherol; roots contained very little or no tocopherol. Contents of gamma-and delta-tocopherol in soja and lupine decreased during germination and growth, whereas the alpha-tocopherol concentration increases significantly. This evidence suggests that non-alpha-to-copherols might be methylated enzymatically to alpha-tocopherol. Tocochromanol pattern of wheat also changes characteristically in an analogous manner during plant development. Germ i­ nation of sunflower seeds also resulted in a conversion of beta-and gamma-tocopherols and in a slight decrease of the predominantly occurring alpha-tocopherol. In relation to the lipid content, the concentration of total tocopherols in oil plants increases significantly during growth. Possible implications for the biosynthesis of tocochromanols are discussed. 
  Reference    Z. Naturforsch. 40c, 760—766 (1985); received September 6. 1985 
  Published    1985 
  Keywords    Tocochromanols, Plant Oils Chlorophyll, Germination, Growth 
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 TEI-XML for    default:Reihe_C/40/ZNC-1985-40c-0760.pdf 
 Identifier    ZNC-1985-40c-0760 
 Volume    40 
2Author    M. Wink, L. WitteRequires cookie*
 Title    Quinolizidine Alkaloids as Nitrogen Source for Lupin Seedlings and Cell Cultures  
 Abstract    The alkaloid patterns during germination and seedling development of Lupinus polyphyllus, L. angustifolius, L. albus, L. pubescens, Cytisus scoparius, Baptisia australis, Spartium junceum and Laburnum anagyroides were studied by capillary glc and EI-MS and CI-MS. The alkaloid contents were relatively high in the seeds and decreased by 20—100% during germination and the early developmental stages. The plants with fully developed leaves were able to synthesize new alkaloids. The decrease of alkaloid concentrations during germination was interpreted in terms of alkaloid turnover and use of the alkaloidal nitrogen for seedling development. The ability of plants to rely on the alkaloidal nitrogen as a nitrogen source could also be shown in lupin cell cultures which could survive and even grow on media which contained sparteine as the sole nitrogen source. 
  Reference    Z. Naturforsch. 40c, 767—775 (1985); received August 19/September 4 1985 
  Published    1985 
  Keywords    Alkaloid Turnover, Quinolizidine Alkaloids, Lupinus, Germination, Nitrogen Source 
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 TEI-XML for    default:Reihe_C/40/ZNC-1985-40c-0767.pdf 
 Identifier    ZNC-1985-40c-0767 
 Volume    40 
3Author    J. Polster, M. Schwenk, E. BengschRequires cookie*
 Title    The Role of Boron, Silicon and Nucleic Bases on Pollen Tube Growth of Lilium longiflorum (L.)  
 Abstract    It is possible to obtain pollen germination and pollen tube growth in vitro if boric acid is present. In this work the effect was studied using as a semiquantitative parameter the mean length (J) o f Lilium longißorum pollen tubes. Pollen tube growth was examinated in depend­ ence on boric acid, ortho-silicic acid, nucleic bases, Ca2+ and Zn2+ in 10% sucrose solution. The maximum o f 7is obtained for concentrations between 2 -2 0 ppm boron. The simultaneous supply o f silicon added as water glass leads to a synergistic stimulation effect on pollen tube growth and facilitates branching. The silicon action is preceded o f a pollen tube growth inhibi­ tion period during 3 h. Adenine and guanosine are able to substitute partially boron as pollen germination and pollen tube growth stimulator. Concentrations o f 100 ppm adenine leads to half the boron effect. The same stimulation effect is obtained by guanosine. Ca2+ can partially substitute boron as well. The stimulation action o f boron is significantly attenuated by Zn2+ and by the herbicide Dicuran. These and preceding results from physiological studies indicate that boron and silicon should be essential trace elements for the regulation o f molecular bio­ logical processes. 
  Reference    Z. Naturforsch. 47c, 102—2 (1992); received June 13/September 16 1991 
  Published    1992 
  Keywords    Pollen Tube Growth, Boron, Silicon, Lilium longiflorum, Germination 
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 TEI-XML for    default:Reihe_C/47/ZNC-1992-47c-0102.pdf 
 Identifier    ZNC-1992-47c-0102 
 Volume    47