Abstract
The flavonols from each of 38 poinsettia cultivars were quantitatively resolved by HPLC. Careful selection of samples revealed significant quantitative differences in flavonol content. While all cultivars of seedling origin could be differentiated on the basis of their flavonols, several families of sports could not. Most new commercial poinsettia cultivars have been selected from among somatic mutants exhibiting different bract color. Such changes in color were usually the results of change in anthocyanin content rather than flavonol content. The flavonol content increased in color sports with less anthocyanin. Three of the flavonols were absent from a few of the cultivars but most differences between cultivars were only quantitative. Genetic data suggested independent assortment of control of quercetin 3-rhamnoside and quercetin 3-galactoside synthesis but linkage of quercetin 3-rhamnoside and kaempferol 3-rhamnoside synthesis.
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