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'Flavonoid Biosynthesis' in keywords
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1986 (1)
1984 (1)
1981 (1)
1Author    G. Stotz, G. ForkmannRequires cookie*
 Title    Oxidation of Flavanones to Flavones with Flower Extracts of Antirrhinum majus (Snapdragon)  
 Abstract    Enzyme preparations from flowers of Antirrhinum majus catalysed the oxidation of naringenin to apigenin and o f eriodictyol to luteolin. Enzyme activity was found to be localized in the microsomal fraction. The reaction required NADPH as cofactor and had a pH optimum o f about 7.0. The NADPH-dependent microsomal enzyme activity was also present in flower extracts of other flavone-producing plants, whereas flower extracts of plants which lack flavones were found to lack also this enzyme activity. 
  Reference    Z. Naturforsch. 36c, 737—741 (1981); received June 4 1981 
  Published    1981 
  Keywords    Antirrhinum majus, Flavonoid Biosynthesis, Flavanone Oxidase, Apigenin, Luteolin 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-0737.pdf 
 Identifier    ZNC-1981-36c-0737 
 Volume    36 
2Author    R. R. Br, G. Spribille, ForkmannRequires cookie*
 Title    Conversion of Dihydroflavonols to Flavonols with Enzyme Extracts from Flower Buds of Matthiola incana  
 Abstract    Soluble enzyme preparations from flower buds of Matthiola incana catalysed the conversion of dihydrokaempferol to kaempferol and of dihydroquercetin to quercetin. The reaction required 2-oxoglutarate, ascorbate and Fe2+ as cofactors and had a pH-optimum at about 7.0. Highest enzyme activity was already present in the youngest buds followed by a rapid decline during bud and flower development. Furthermore, a substantial correlation was observed between the enzyme activity for flavonol formation and the flavonol content of the buds and flowers. 
  Reference    Z. Naturforsch. 39c, 714—719 (1984); received April 4/May 23 1984 
  Published    1984 
  Keywords    Dioxygenase, Flavonoid Biosynthesis, Flavonols, Matthiola incana 
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 TEI-XML for    default:Reihe_C/39/ZNC-1984-39c-0714.pdf 
 Identifier    ZNC-1984-39c-0714 
 Volume    39 
3Author    G. Forkm, P. De Vlaming, R. Spribille, H. Wiering, A. W. SchramRequires cookie*
 Title    Genetic and Biochemical Studies on the Conversion of Dihydroflavonols to Flavonols in Flowers of Petunia hybrida  
 Abstract    Soluble enzyme preparations from flower buds of Petunia hybrida catalyzed the conversion of dihydroflavonols to flavonols. Dihydrokaempferol and dihydroquercetin were readily converted to the respective flavonols, whereas dihydromyricetin was a poor substrate. The reaction required 2-oxoglutarate, ascorbate and Fe2+ as cofactors and had a pH optimum at about 6.5. In the presence of the dominant allele FI, high enzyme activity for flavonol formation was found, whereas in enzyme preparations from flower buds of recessive genotypes (fl/fl) only low enzyme activity could be observed. A substantial correlation was found between enzyme activity for flavonol formation and the flavonol content of buds and flowers during development. 
  Reference    Z. Naturforsch. 41c, 179 (1986); received July 27/September 26 1985 
  Published    1986 
  Keywords    birthday Dioxygenase, Flavonoid Biosynthesis, Flavonols, Genetic Control, Petunia hybrida 
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 TEI-XML for    default:Reihe_C/41/ZNC-1986-41c-0179.pdf 
 Identifier    ZNC-1986-41c-0179 
 Volume    41