Figure 4.

Expanded expression of CYC1C and CYC1D accounts for the formation of peloric flowers in F1 hybrid offspring. A, Normal Ps × Pg offspring have typical zygomorphic flowers, with two smaller dorsal petals (DP) compared with lateral (LP) and ventral petals (VP) and only two fertile ventral stamens (VS). B, The side view of wild-type (WT) flowers. C, The floral diagram of wild-type flowers. D, Peloric flowers have five petals that adopt the dorsal petal identity of wild-type flowers, as well as five staminodes. E, The side view of mutant (MU) flowers. F, The floral diagram of mutant flowers. The expression domains of both CYC1C (G) and CYC1D (H) expanded from dorsal to lateral and ventral petals in mutant flowers. I, The expression pattern of CIN1 was unaffected in mutant flowers. ACTIN was used as an internal reference. Data are mean ± sd of three biological replicates, with each including three technical replicates. DS, Dorsal stamens; LS, lateral stamens. Bars = 1 cm.