ZfN: Search Results

1	Author	G. Stotz, G. Forkmann	Requires 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
	Similar Items	Find
	DEBUG INFO
	TEI-XML for	default:Reihe_C/36/ZNC-1981-36c-0737.pdf
	Identifier	ZNC-1981-36c-0737
	Volume	36

2	Author	G. Forkmann, G. Stotz	Requires 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
	Similar Items	Find
	DEBUG INFO
	TEI-XML for	default:Reihe_C/36/ZNC-1981-36c-0411.pdf
	Identifier	ZNC-1981-36c-0411
	Volume	36