Abstract
Relative anthocyanin and aurone concentrations have been measured spectrophotometrically in 25 of 27 possible color genotypes of the garden snapdragon, Antirrhinum majus. The results have allowed the following generalizations to be formulated for the case of gene-controlled pigmentation in A. majus. 1. 1. Increased numbers of recessive factors result in decreased anthocyanin production. 2. 2. Genotypes containing pelargonidin glycoside have a significantly lower concentration of anthocyanin than genotypes containing cyanidin glycoside. 3. 3. Highest concentration of aurone is associated with genotypes —yy. 4. 4. Increased numbers of dominant factors result in decreased aurone production. 5. 5. High anthocyanin concentration is related to low aurone concentration and, conversely, low anthocyanin concentration is related to high aurone concentration. 6. 6. The chemical consequence of heterozygosity is an alteration in the magnitude of the effect produced by the dominant alleles. A general pathway for the biosynthesis of the flavonoid pigments of A. majus has been proposed.
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