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1984 (1)
1Author    J. M. Steyns, O. M. Astenbroek, *. @bullet, G. Van Nigtevecht, J. Van BrederodeRequires cookie*
 Title    07g and D6a: Two Flavone Glycosylating Genes in Silene, which are Only Expressed in Cotyledons and Rosette Leaves  
 Abstract    Two further loci can be added to the three already known (g , g l and f g) in Silene controlling the 7 -0 and 2"-0-glycosylation o f the C -glycosylflavone isovitexin (6-C -glucosylapigenin). These loci, 0 7 g for the 7-O-galactosylation and D6a for the 2"-0-arabinosylation, appear only to be expressed in cotyledons and rosette leaves and control the biosynthesis o f isovitexin 7 -0 -galactoside and isovitexin 7-0-galactose 2"-0-arabinosid e in these parts o f plants in which the recessive alleles o f the loci g, g l and f g are hom ozygous (Steyns et al. [9]). The possibility that locus g, whose dominant alleles gG and g X control the 7-0-glu cosylation and the 7-0-xylosylation o f isovitexin respectively, controls the synthesis o f isovitexin-7-O -galactoside was excluded by demonstrating the presence o f isovitexin-7-O -galactoside and the 7-0-galactosyltransferase catalyzing its biosynthesis in addition to isovitexin-7-O -glucoside and the 7-0-glucosyltransferase in cotyledons o f gGgG seedlings. The synthesis o f the 2"-0-arabinoside is neither controlled by locus gl, whose dom inant alleles glR and glA control the 2"-0-rham nosylation and 2"-0-arabinosylation o f isovitexin respectively, nor by locus fg, whose dom inant allele Fg controls the biosynthesis o f isovitexin 2"-0-glucoside. This was shown by the presence o f isovitexin-7-O -galactose 2"-0-arabinosid e and the 2"-0-arabinosyltransferase catalyzing the synthesis o f the 2"-0-arabinosid e in addition to isovitexin-7-O-galactose 2"-0-rham noside in cotyledons o f g lR g lR seedlings and by the presence o f isovitexin-7-O-galactose 2"-0-arabinoside and the 2"-0-arabinosyltransferase in addition to isovitexin-7-O-galactose 2"-0-glucoside and the 2"-0-glucosyltransferase in cotyledons o f FgFg seedlings. 
  Reference    Z. Naturforsch. 39c, 568—5 (1984); received January 26/M arch 16 1984 
  Published    1984 
  Keywords    Silene, Flavone Glycosylation Genes, O 7g: Isovitexin 7-O -G alactoside, D6a: Isovitexin 2"-0-A rabinoside, Ontogeny 
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 TEI-XML for    default:Reihe_C/39/ZNC-1984-39c-0568.pdf 
 Identifier    ZNC-1984-39c-0568 
 Volume    39