Signaling in shoot and flower meristems of Arabidopsis thaliana.

Meristems are centers of cell proliferation with a defined internal structure that is dynamically perpetuated throughout a plant's life although its constituent cells constantly change. When progressing from stem cell state towards differentiation, individual cells adopt developmental programs according to their current position within the meristem provided by signals from neighboring cells. In recent years, progress has been made in the identification of signaling pathways and their integration into mechanistic networks.