Differential Regulation of Flavone Glycosylation during Ontogeny of Silene pratensis

Autor:	Gerard J. Niemann, J. M. Steyns, G. van Nigtevecht, Jan van Brederode
Rok vydání:	1983
Předmět:	chemistry.chemical_classification Silene Glycosylation biology Ontogeny Flavonoid Caryophyllaceae Differential regulation biology.organism_classification General Biochemistry Genetics and Molecular Biology chemistry.chemical_compound chemistry Biochemistry Biosynthesis Botany
Zdroj:	Zeitschrift für Naturforschung C. 38:544-548
ISSN:	1865-7125 0939-5075
DOI:	10.1515/znc-1983-7-808
Popis:	Two isovitexin glycosides have been found in the cotyledons and foliage leaves of Sitene pratensis plants that are unable to glycosylate isovitexin in their petals (genotype gg glgl fgfg). The glycosides (isovitexin 7-O-galactoside and isovitexin 7-O-galactose 2″-O-arabinoside) were present only in the lower leaves: leaves produced later in the development of the flower stem accumulated only the aglycon isovitexin. The transition in the flavone composition during the ontogeny of the plants could be influenced by light intensity. In plants grown at low light intensity, glycoside production continued until a higher leaf pair number than in plants grown at higher light intensities. However, the effect of light intensity is indirect: the transition in the flavone composition is correlated with the transition from rosette leaves to stem leaves. The presence of the 7-O-galactosides in cotyledons and rosette leaves suggests that in addition to the g, gl and fg loci, there are further glycosylating loci which are not expressed in stem leaves and petals.
Databáze:	OpenAIRE
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