Stomatal Patterning and Guard Cell Differentiation
Gas exchange between plants and the atmosphere takes place through stomata (singular,stoma), which are microscopic valves on the plant epidermis composed of paired guard cells. Stomatal differentiationinvolves a series of asymmetric divisions of precursor cells followed by a single symmetric celldivision that produces terminally differentiated guard cell pairs. Stomatal development emerged as a modelsystem to study how environmental- and cell-cell signals translate into site/orientation of asymmetric celldivision and cell-type differentiation. This chapter focuses on cell-state transition events leading toguard cell differentiation in the model plant Arabidopsis, and cell-cell signaling mechanisms controllingstomatal patterning. Understanding how cell-cycle regulators influence stomatal patterning and differentiationwill advance our knowledge of cell division control in plant development.
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