The logic of the floral transition: Reverse-engineering the switch controlling the identity of lateral organs
Fig 6
A Shoot Apical Meristem is a dome-shaped structure whose zonal cell types (identities) have been depicted in different colors. The Organizing Center (OC), Flank, Peripheral Zone (PZ), Central Zone (CZ) and internal cells are shown in progressively paler shades of green, while an Anlage and Primordium are shown in two shades of brown. Cells in the CZ grow, divide and differentiate into the PZ or an Anlage, which respectively go on to become the flank or a primordium. Each Anlage is generated periodically. In a vegetative meristem, these Anlagen go on to produce primordia that lack their own OC and grow into leaves. Inflorescence meristems produce Anlagen that become floral primordia that do contain their own OCs (colored red).