Fig. 1

In vitro petal regeneration of grape hyacinth. Young and mature inflorescence of grape hyacinth (a), flower bud during the colour-turning period of flower organ induction (b, c), the explants swelled and turned green (d), callus formation (e), flower petal primordia formation (f), a break in the colour of regenerated petals (g), fully pigmented regenerated petals (h), petal-like structures (i). Scale bar in a: 0.5 cm, Scale bar in b–i: 100 μm