Gerrit van Nigtevecht

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Sex-linked and sex-influenced inheritance are of interest because of their relation to the still intriguing problem of sex detrmination. Genes involved in the formation of the sex organs are regarded to be sex-determining genes. These genes may be present in all chromosomes including the sex-chromosomes. Other genes present in the sex-chromosomes, but not(More)
An enzyme catalyzing the transfer of the glucosyl moiety of UDP-glucose to the 3-hydroxyl group of cyanidin has been demonstrated in petal extracts of Silene dioica mutants with cyanidin-3-O-glucoside in the petals. This transferase activity was also present in young rosette leaves and calyces of these plants. The highest glucosyltransferase activity was(More)
The glycosylation of flavones in the petals of Melandrium album is shown to be controlled by the genes G, X and A. In the presence of the recessive alleles of these genes, only the aglycone isovitexin (6-C-glucosylapigenin) is found in the petals. The gene G controls the transfer of glucose, the gene X the transfer of xylose to the 7-hydroxyl group of(More)
In a chemicogenetic analysis of the geographical distribution of flavone-glycosides in the petals of Melandrium album, we found two unknown flavone-glycosides in ten Hungarian and four German populations. By means of classical techniques for the identification and structure determination of flavonoids, the structure of these flavones turned out to be(More)
In a hybrid swarm of Melandrium dioicum and Melandrium album, a plant was found in which the genes g G and g X, controlling an isovitexin 7-O-glucosyltransferase, respectively an isovitexin 7-O-xylosyltransferase, were co-dominant. In earlier experiments, gene g G was always dominant over its allele g X. Genetical and biochemical analysis revealed that this(More)
An enzyme catalyzing the transfer of the glucosyl moiety of UDP-glucose to the 5-hydroxyl group of cyanidin-3-rhamnosyl-(1→6)-glucoside has been demonstrated in petal extracts of Silene dioica plants. This glucosyltransferase activity was not detectable in green parts of these plants. The enzyme activity is controlled by a single dominant gene M; no(More)
In extracts of petals of M. album, an enzyme has been demonstrated which catalyzes the transfer of the glucosyl moiety of UDP-glucose to the 7-hydroxylgroup of isovitexin. This enzyme is controlled by a dominant gene G; in plants with the recessive genotype no glucosyltransferase activity could be detected. The enzyme was purified 16-fold by (NH4)2SO4(More)
Apart from the genes I1 and Ia which control the intensity of flower colour, the genes C, A, P, M, N and AC are involved in anthocyanin biosynthesis in Silene dioica. In c/c plants no anthocyanins are present in any part of the plant. Gene A controls the formation of anthocyanin in the petals. Gene M governs the glucosylation of the 5-hydroxyl group of(More)
Three of the loci controlling isovitexin glycosylation inSilene pratensis are polymorphic and show geographic trends which are compared with geographic trends in seed morphology (and other phenotypic characters) as demonstrated by multivariate analysis. Various lines of evidence support the hypothesis thatS. pratensis spread into Europe from at least two(More)
Silene dioica, Caryophyllaceae, Anthocyanin Biosynthesis, Cyanidin-, Pelargonidin-glycosides, Glycosyltransferases, Genetic Control An enzyme catalyzing the transfer of the rhamnosyl moiety of UDP-L-rhamnose to the 6 -hydroxyl group of the 3-O-bound glucose of anthocyanidin 3-O-glucosides has been demonstrated in petal extracts of Silene dioica plants. The(More)