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Segregation in flower colors and the relationship between flower color and flavone content of F₁ hybrids obtained from 2x × 4x and it´s reciprocal crosses were studied in rose of Sharon (Hibiscus syriacus L.) by colorimetric and spectrophotometric methods. In all color groups of F₁ hybrids and their parents, white, white with red eye, purple, and blue groups contained higher flavone content (0.683 - 2.858 ㎎/㎠ petal) than pink and red groups (0.062 - 0.453 ㎎/㎠ petal). Color classification of F₁ hybrids based on the λ_(vis)max of fresh petals was significantly related with flavone contents in cyanic flowers. In the F₁ hybrids derived from white (including white with red eye) × red, purple × red, blue × red, and their reciprocal crosses, groups of purple and white with red eye colors were predominantly observed, while pink and red color groups were observed only in F₁ hybrids derived from red × red crosses. Thus, the higher content of flavone in white, white with red eye, purple, and blue groups was dominant to the lower content of flavone in red group, and this dominance was not affected by the ploidy level of parents. The higher content of flavone of parents made white flowers into dull creamy colors and cyanic flowers into dull pinkish, purplish, and bluish colors in F₁ hybrids. Therefore, it can be recommended that red cultivars having lower flavone content are good parents for breeding a new cultivar with bright cyanic colors in Rose of Sharon.
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