In the last few years there have been tremendous advances in the understanding of signals and signalling pathways that operate at the cellular level and lead to developmental processes. In 27 chapters, this volume investigates the cellular and molecular basis of plant development. It highlights the most recent progress on signals, machinery, and pathways in the plant cell. Emphasis is placed on integrating these studies with those on cell division, cell plate formation, and other aspects of plant development, in order to elucidate the intricate relationships between them.