Cell lineage, cell signaling and the control of plant morphogenesis

It is clear that cell-cell signaling is critical for the development of bot h root and shoot structures. Recently, several of the key gene products req uired for intercellular signaling have been defined, and the developmental processes regulated by cell-cell interactions are beginning to be elucidate d. Surprisingly, these results suggest that the mechanisms by which plant c ells communicate with each other may be quite distinct from those used in a nimal systems.