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Breaking the silence: three bHLH proteins direct cell‐fate decisions during stomatal development
Author(s) -
Pillitteri Lynn Jo,
Torii Keiko U.
Publication year - 2007
Publication title -
bioessays
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.175
H-Index - 184
eISSN - 1521-1878
pISSN - 0265-9247
DOI - 10.1002/bies.20625
Subject(s) - guard cell , cell fate determination , microbiology and biotechnology , arabidopsis , biology , gene , cell , cellular differentiation , botany , genetics , transcription factor , mutant
Stomata are microscopic pores on the surface of land plants used for gas and water vapor exchange. A pair of highly specialized guard cells surround the pore and adjust pore size. Studies in Arabidopsis have revealed that cell–cell communication is essential to coordinate the asymmetric cell divisions required for proper stomatal patterning. Initial research in this area identified signaling molecules that negatively regulate stomatal differentiation. However, genes promoting cell‐fate transition leading to mature guard cells remained elusive. Now, three closely related basic helix–loop–helix (bHLH) proteins, SPEECHLESS, MUTE and FAMA have been identified as positive regulators that direct three consecutive cell‐fate decisions during stomatal development. The identification of these genes opens a new direction to investigate the evolution of stomatal development and the conserved functions of bHLH proteins in cell type differentiation adopted by plants and animals. BioEssays 29:861–870, 2007. © 2007 Wiley Periodicals, Inc.