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Science 292 (5524): 2070-2072

Copyright © 2001 by the American Association for the Advancement of Science

G Protein Regulation of Ion Channels and Abscisic Acid Signaling in Arabidopsis Guard Cells

Xi-Qing Wang,1 Hemayet Ullah,2 Alan M. Jones,2 Sarah M. Assmann1*

The phytohormone abscisic acid (ABA) promotes plant water conservation by decreasing the apertures of stomatal pores in the epidermis through which water loss occurs. We found that Arabidopsis thaliana plants harboring transferred DNA insertional mutations in the sole prototypical heterotrimeric GTP-binding (G) protein alpha  subunit gene, GPA1, lack both ABA inhibition of guard cell inward K+ channels and pH-independent ABA activation of anion channels. Stomatal opening in gpa1 plants is insensitive to inhibition by ABA, and the rate of water loss from gpa1 mutants is greater than that from wild-type plants. Manipulation of G protein status in guard cells may provide a mechanism for controlling plant water balance.

1 Biology Department, Pennsylvania State University, 208 Mueller Laboratory, University Park, PA 16802-5301, USA.
2 Department of Biology, University of North Carolina, Chapel Hill, NC 27599-3280, USA.
*   To whom correspondence should be addressed. E-mail: sma3{at}

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NADPH oxidase AtrbohD and AtrbohF genes function in ROS-dependent ABA signaling in Arabidopsis.
J. M. Kwak, I. C. Mori, Z.-M. Pei, N. Leonhardt, M. A. Torres, J. L. Dangl, R. E. Bloom, S. Bodde, J. D. G. Jones, and J. I. Schroeder (2003)
EMBO J. 22, 2623-2633
   Abstract »    Full Text »    PDF »
A Reevaluation of the Role of the Heterotrimeric G Protein in Coupling Light Responses in Arabidopsis.
A. M. Jones, J. R. Ecker, and J.-G. Chen (2003)
Plant Physiology 131, 1623-1627
   Abstract »    Full Text »    PDF »
The {beta}-Subunit of the Arabidopsis G Protein Negatively Regulates Auxin-Induced Cell Division and Affects Multiple Developmental Processes.
H. Ullah, J.-G. Chen, B. Temple, D. C. Boyes, J. M. Alonso, K. R. Davis, J. R. Ecker, and A. M. Jones (2003)
PLANT CELL 15, 393-409
   Abstract »    Full Text »    PDF »
The Nitrate Transporter AtNRT1.1 (CHL1) Functions in Stomatal Opening and Contributes to Drought Susceptibility in Arabidopsis.
F.-Q. Guo, J. Young, and N. M. Crawford (2003)
PLANT CELL 15, 107-117
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Genome-wide gene expression profiling in Arabidopsis thaliana reveals new targets of abscisic acid and largely impaired gene regulation in the abi1-1 mutant.
S. Hoth, M. Morgante, J.-P. Sanchez, M. K. Hanafey, S. V. Tingey, and N.-H. Chua (2002)
J. Cell Sci. 115, 4891-4900
   Abstract »    Full Text »    PDF »
ABA-Activated SnRK2 Protein Kinase is Required for Dehydration Stress Signaling in Arabidopsis.
R. Yoshida, T. Hobo, K. Ichimura, T. Mizoguchi, F. Takahashi, J. Aronso, J. R. Ecker, and K. Shinozaki (2002)
Plant Cell Physiol. 43, 1473-1483
   Abstract »    Full Text »    PDF »
OSM1/SYP61: A Syntaxin Protein in Arabidopsis Controls Abscisic Acid-Mediated and Non-Abscisic Acid-Mediated Responses to Abiotic Stress.
J. Zhu, Z. Gong, C. Zhang, C.-P. Song, B. Damsz, G. Inan, H. Koiwa, J.-K. Zhu, P. M. Hasegawa, and R. A. Bressan (2002)
PLANT CELL 14, 3009-3028
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