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Fig. 1

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Petal color change and expansion growth of Ipomoea tricolor cv. Heavenly Blue. (A) Whole flower growth. The right photos are half-cut buds. Bar: 2.0 cm. (B) Transverse section of petals. Bar: 50 μm. (C) Structure of heavenly blue anthocyanin (HBA) (D) Cryo-SEM appearance of a fully-opened petal at 0 h. Bar: 100 μm. (E) Cell volume increase of adaxial colored epidermis during the last 24 h. (n = 9, mean ± SD). ***: significant differences (P < 0.001) between −24 h; §: significant difference (P < 0.05) between −12 h; § § §: significant difference (P < 0.001) between −12 h.

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