Figure 3.

The process of flower bud differentiation in the apical and axillary buds of strong upright spring shoots of blueberries. (A) Anatomical structural characteristics of blueberry strong upright spring shoot flower bud differentiation at different stages. ① Undifferentiated flower buds; ② Early flower bud differentiation stage; ③ Inflorescence primordium differentiation stage; ④ Sepal primordium differentiation stage; ⑤ Petal primordium differentiation stage; ⑥ Stamen primordium differentiation stage; ⑦ Carpel primordium differentiation stage. Gc (growth cone); Ip (inflorescence primordium); Fp (flower primordium); Se (sepal primordium); Pe (petal primordium); Sp (stamen primordium); A (anthers); F (filament); Pi (pistil); Ova (ovary). (B) The proportion of samples taken at each developmental stage is based on the differentiation period of apical and axillary buds in (A).