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'Antirrhinum majus' in keywords Facet   section ZfN Section C  [X]
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1981 (2)
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    G. Forkmann, G. StotzRequires cookie*
 Title    Genetic Control of Flavanone 3-Hydroxylase Activity and Flavonoid 3'-Hydroxylase Activity in Antirrhinum majus (Snapdragon)  
 Abstract    In flower extracts o f defined genotypes o f Antirrhinum majus, two different hydroxylases were found catalysing the hydroxylation o f naringenin and eriodictyol in the 3-position and of naringenin in the 3'-position. The 3-hydroxylase is a soluble enzyme and belongs according to its cofactor requirement to the 2-oxoglutarate-dependent dioxygenases. Investigations on different genotypes revealed a clear correlation between block o f the anthocyanin pathway by recessive alleles of the gene inc and a complete lack of 3-hydroxylase activity. Chemogenetic studies on different genotypes suggested that the 3'-hydroxyl group of the B-ring of flavonoids is introduced at the stage of C15 intermediates. The corresponding 3'-hydroxylase was found to be localized in the microsomal fraction and required NADPH as cofactor. In confirmation o f the chemogenetic studies, a strict correlation was found between 3'-hydroxylase activity and the gene eos which is known to control the hydroxylation o f flavones, flavonols and anthocyanins in the 3'-position. These results are similar to those previously obtained with Matthioia incana. 
  Reference    Z. Naturforsch. 36c, 411 (1981); received January 20 1981 
  Published    1981 
  Keywords    Anthocyanin Biosynthesis, Antirrhinum majus, Flavonoids, Flavanone 3-Hydroxylase, Flavonoid 3'-Hydroxylase, Genetic Control 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-0411.pdf 
 Identifier    ZNC-1981-36c-0411 
 Volume    36