Pathways
ABA Signaling in Arabidopsis Stomatal Guard Cell
Description:
Plants have pores, Stomata, on their leaf surfaces that allow CO2 (Carbon Dioxide) in for photosynthesis and through which water evaporates. The specific cells that border and define these pores are Guard Cells. Guard Cells literally guard the size of the pore by alternately swelling, which opens the pore, or shrinking, which closes the pore. Plants must respond to a variety of environmental cues and regulate their Stomata accordingly so that enough CO2 gets in, but not so much water escapes that the plant dries...
References:
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Guard cells: a dynamic signaling model.
Curr Opin Plant Biol. 2004 Oct;7(5):537-46. -
Visualization of abscisic acid-perception sites on the plasma membrane of stomatal guard cells.
Plant J. 2003 Jul;35(1):129-39. -
The Arabidopsis putative G protein-coupled receptor GCR1 interacts with the G protein alpha subunit GPA1 and regulates abscisic acid signaling.
Plant Cell. 2004 Jun;16(6):1616-32. Epub 2004 May 21. -
Inactivation of AtRac1 by abscisic acid is essential for stomatal closure.
Genes Dev. 2001 Jul 15;15(14):1808-16.
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