Position and identity, two separable but inseparable processes in floral meristem patterning

Abstract

Early floral meristem (FM) patterning is one of the most intensively studied developmental programs in plants. While extensive work has uncovered the molecular networks underlying key processes such as organ initiation and identity specification, integrating this knowledge into a comprehensive framework remains challenging. Organ initiation is governed by auxin-mediated positioning and boundary formation, whereas organ identity is determined by the combinatorial activities of ABCE-class transcription factors. These processes have often been studied in isolation, even though proper flower development requires their coordination in space and time. This review synthesizes current insights into early floral organ initiation and identity determination, and potential molecular links bridging these two programs. I also discuss persistent gaps in our understanding, the challenges in addressing these knowledge gaps, and how emerging tools can help disentangle the complex crosstalk between initiation and identity, ultimately advancing a more integrated view of the regulatory networks that pattern the early FM.