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The Plant Cell, Vol. 13, 2513-2523, November 2001, Copyright © 2001,
American Society of Plant Biologists

Abscisic Acid Activation of Plasma Membrane Ca2+ Channels in Guard Cells Requires Cytosolic NAD(P)H and Is Differentially Disrupted Upstream and Downstream of Reactive Oxygen Species Production in abi1-1 and abi2-1 Protein Phosphatase 2C Mutants

Yoshiyuki Murata1, Zhen-Ming Pei2, Izumi C. Mori and Julian Schroeder3

Division of Biology, Cell and Developmental Biology Section, and Center for Molecular Genetics, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0116

3 To whom correspondence should be addressed. E-mail julian{at}ucsd.edu; fax 858-534-7108

The hormone abscisic acid (ABA) regulates stress responses and developmental processes in plants. Calcium-permeable channels activated by reactive oxygen species (ROS) have been shown recently to function in the ABA signaling network in Arabidopsis guard cells. Here, we report that ABA activation of these ICa Ca2+ channels requires the presence of NAD(P)H in the cytosol. The protein phosphatase 2C (PP2C) mutant abi1-1 disrupted ABA activation of ICa channels. Moreover, in abi1-1, ABA did not induce ROS production. Consistent with these findings, in abi1-1, H2O2 activation of ICa channels and H2O2-induced stomatal closing were not disrupted, suggesting that abi1-1 impairs ABA signaling between ABA reception and ROS production. The abi2-1 mutation, which lies in a distinct PP2C gene, also disrupted ABA activation of ICa. However, in contrast to abi1-1, abi2-1 impaired both H2O2 activation of ICa and H2O2-induced stomatal closing. Furthermore, ABA elicited ROS production in abi2-1. These data suggest a model with the following sequence of events in early ABA signal transduction: ABA, abi1-1, NAD(P)H-dependent ROS production, abi2-1, ICa Ca2+ channel activation followed by stomatal closing.




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