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PLANT PHYSIOLOGY , Vol 114, Issue 4 1557-1560, Copyright © 1997 by American Society of Plant Biologists
Convergence of the Abscisic Acid, CO2, and Extracellular Calcium Signal Transduction Pathways in Stomatal Guard Cells
AAR. Webb and A. M. Hetherington
Division of Biological Sciences, University of Lancaster, Lancaster, LA1 4YQ United Kingdom
We show that guard cells from Arabidopsis thaliana plants carrying the
abscisic acid-insensitive mutations abi1 and abi2 fail to respond to CO2
and extracellular calcium. This demonstrates that the signal transduction
pathways for all three stimuli converge on, or close to, the ABI1 and ABI2
gene products.
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