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lüll Stomatal development: new signals and fate determinants Nadeau JACurr Opin Plant Biol 2009[Feb]; 12 (1): 29-35Stomata and pavement cells are produced by a series of asymmetric divisions and progressive fate transitions within a stem cell lineage. In Arabidopsis, this process is regulated so that new lineages can be inserted between previously differentiated cells while maintaining stomatal spacing. The small peptide EPIDERMAL PATTERNING FACTOR 1 may be a positional signal secreted by stomatal precursors to modulate behavior of nearby cells. Signal-receiving cells may use TOO MANY MOUTHS and ERECTA family receptors and a MAPK pathway to regulate initiation of new lineages, promote asymmetric division, and control the plane of spacing divisions. Cell fate transitions are controlled by basic helix-loop-helix transcription factor (bHLH), MYB, and MADS-box transcription factors, and there is evidence of miRNA regulation. These results provide insight into positive and negative influences on stomatal cell transitions and suggest points of potential environmental regulation.|*Cell Lineage[MESH]|*Signal Transduction[MESH]|Cell Division[MESH]|MicroRNAs/metabolism[MESH]|Mutation/genetics[MESH]|Plant Stomata/*cytology/*growth & development[MESH] |