Summary
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 isovitexin. The gene G is epistatic over X. In the presence of the gene A arabinose is coupled to the carbon-carbon bound glucose of isovitexin. In the presence of both G and A, or both X and A the corresponding di-glycosides are formed.
The petals of the plants in which all genes for the flavone glycosylation are present in the homozygous recessive form are of a particular phenotype.
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van Brederode, J., van Nigtevecht, G. The genetic control of isovitexin-glycosylation in the petals of Melandrium album . Molec. gen. Genet. 118, 247–259 (1972). https://doi.org/10.1007/BF00333461
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DOI: https://doi.org/10.1007/BF00333461