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Carotenoid Flower Pigments in Rhododendron1


The major carotenoid pigments in the yellow flower petals (corollas) of Rhododendron species and cultivars were β-carotene, prolycopene, α-carotene-5,6-epoxide, lutein, andluetin-5, 6-epoxide. Lycopene was a major constituent in only one hybrid of dubious parentage. Several undetermined xanthophylls were present in trace amounts. Rhododendrons whose petals contained the flavonol gossypetin 6-galactoside also contained carotenoid pigments. Yellow-flowered deciduous azaleas contained a greater number of trace xanthophylls, but otherwise there were no significant differences in major carotenoids between various groups in the genus.