ZfN: Search Results

1	Author	B. D. Angelm Ayr, G. Stotz, R. Spribille, O. Rk	Requires cookie*
	Title	Relationship between Flower Development, Anthocyanin Accumulation and Activity o f Enzymes Involved in Flavonoid Biosynthesis in Matthiola incana R. Br
	Abstract	The activity of five enzymes concerning anthocyanin biosynthesis as well as the anthocyanin accumulation were studied during the developm ent o f buds and flowers o f Matthiola incana. The investigations included the first three enzymes in the anthocyanin pathw ay, chalcone synthase, chalcone isomerase and flavanone 3-hydroxylase, and the flavonoid-m odifying enzymes, flavo-noid 3'-hydroxylase and flavonoid 3-O-glucosyltransferase. The bud and flower development was subdivided into eight stages with respect to m orphological criteria. On a fresh weight basis, a substantial correlation between anthocyanin content and the activities o f all o f the five enzymes were found in the various developmental stages. Furtherm ore, the anthocyanins formed are obviously not or only less subject to degradation. Although all m axim a of activity proved to be in buds, clear differences were observed between the five enzymes with regard to increase and stage of maximum activity. The isolation of other enzymes involved in flavonoid biosynthesis is likely to be most successful in the bud stages.
	Reference	Z. Naturforsch. 38c, 551—555 (1983); received April 111983
	Published	1983
	Keywords	Matthiola incana, Anthocyanin Biosynthesis, Anthocyanin Content, Enzyme Activities, Flower Development
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	TEI-XML for	default:Reihe_C/38/ZNC-1983-38c-0551.pdf
	Identifier	ZNC-1983-38c-0551
	Volume	38

2	Author	John Kamsteega, Jan Van Brederode, Gerrit Van Nigtevecht	Requires cookie*
	Title	Campion (Silene dioica)
	Abstract	An enzyme catalyzing the transfer of the rhamnosyl moiety of UDP-L-rhamnose to the 6 -hydro-xyl group of the 3-O-bound glucose of anthocyanidin 3-O-glucosides has been demonstrated in petal extracts of Silene dioica plants. The enzyme activity is controlled by a single dominant gene N\ no rhamnosyltransferase activity is found in petals of n/n plants. The 60-fold purified rhamno-syltransferase exhibits a pH optimum of 8.1, has a molecular weight of about 45000 daltons, is sti mulated by the divalent metal ions Mg2+, Mn2+ and Co2+, and has a "true Km" value of 0.09 mM for UDP-L-rhamnose and 2.2 mM for cyanidin 3-O-glucoside. Pelargonidin 3-O-glucoside and delphinidin 3-O-glucoside can also serve as acceptor. The enzyme can also catalyze the rhamnosy-lation of anthocyanidin 3,5-diglucosides although at reduced rate. The biosynthetic pathway for the synthesis of cyanidin 3-rhamnosylglucoside-5-glucoside in petals of S. dioica is discussed.
	Reference	Z. Naturforsch. 35c, 249—257 (1980); received October 22 1979
	Published	1980
	Keywords	Silene dioica, Caryophyllaceae, Anthocyanin Biosynthesis, Cyanidin-, Pelargonidin-glycosides, Glycosyltransferases, Genetic Control
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	TEI-XML for	default:Reihe_C/35/ZNC-1980-35c-0249.pdf
	Identifier	ZNC-1980-35c-0249
	Volume	35

3	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
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	TEI-XML for	default:Reihe_C/36/ZNC-1981-36c-0411.pdf
	Identifier	ZNC-1981-36c-0411
	Volume	36