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First published online January 26, 2007; 10.1105/tpc.106.048298

The Plant Cell 19:63-73 (2007)
© 2007 American Society of Plant Biologists

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Stomatal Development and Patterning Are Regulated by Environmentally Responsive Mitogen-Activated Protein Kinases in Arabidopsis[W]

Huachun Wanga,b,c, Njabulo Ngwenyamab,c, Yidong Liub,c, John C. Walkera,c and Shuqun Zhangb,c,1

a Division of Biological Sciences, University of Missouri, Columbia, Missouri 65211
b Department of Biochemistry, University of Missouri, Columbia, Missouri 65211
c Bond Life Sciences Center, University of Missouri, Columbia, Missouri 65211

1 To whom correspondence should be addressed. E-mail zhangsh{at}missouri.edu; fax 573-884-9676.

Stomata are specialized epidermal structures that regulate gas (CO2 and O2) and water vapor exchange between plants and their environment. In Arabidopsis thaliana, stomatal development is preceded by asymmetric cell divisions, and stomatal distribution follows the one-cell spacing rule, reflecting the coordination of cell fate specification. Stomatal development and patterning are regulated by both genetic and environmental signals. Here, we report that Arabidopsis MITOGEN-ACTIVATED PROTEIN KINASE3 (MPK3) and MPK6, two environmentally responsive mitogen-activated protein kinases (MAPKs), and their upstream MAPK kinases, MKK4 and MKK5, are key regulators of stomatal development and patterning. Loss of function of MKK4/MKK5 or MPK3/MPK6 disrupts the coordinated cell fate specification of stomata versus pavement cells, resulting in the formation of clustered stomata. Conversely, activation of MKK4/MKK5-MPK3/MPK6 causes the suppression of asymmetric cell divisions and stomatal cell fate specification, resulting in a lack of stomatal differentiation. We further establish that the MKK4/MKK5-MPK3/MPK6 module is downstream of YODA, a MAPKKK. The establishment of a complete MAPK signaling cascade as a key regulator of stomatal development and patterning advances our understanding of the regulatory mechanisms of intercellular signaling events that coordinate cell fate specification during stomatal development.


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A Complete MAPK Signaling Cascade That Functions in Stomatal Development and Patterning in Arabidopsis
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