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Science 287 (5451): 300-303

Copyright © 2000 by the American Association for the Advancement of Science

Regulation of Abscisic Acid-Induced Stomatal Closure and Anion Channels by Guard Cell AAPK Kinase

Jiaxu Li, Xi-Qing Wang, Mark B. Watson, Sarah M. Assmann *

Abscisic acid (ABA) stimulates stomatal closure and thus supports water conservation by plants during drought. Mass spectrometry-generated peptide sequence information was used to clone a Vicia faba complementary DNA, AAPK, encoding a guard cell-specific ABA-activated serine-threonine protein kinase (AAPK). Expression in transformed guard cells of AAPK altered by one amino acid (lysine 43 to alanine 43) renders stomata insensitive to ABA-induced closure by eliminating ABA activation of plasma membrane anion channels. This information should allow cell-specific, targeted biotechnological manipulation of crop water status.

Department of Biology, The Pennsylvania State University, 208 Mueller Laboratory, University Park, PA 16802, USA.
*   To whom correspondence should be addressed. E-mail: sma3{at}psu.edu


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Abscisic Acid-Induced Actin Reorganization in Guard Cells of Dayflower Is Mediated by Cytosolic Calcium Levels and by Protein Kinase and Protein Phosphatase Activities.
J.-U. Hwang and Y. Lee (2001)
Plant Physiology 125, 2120-2128
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Gibberellin/Abscisic Acid Antagonism in Barley Aleurone Cells: Site of Action of the Protein Kinase PKABA1 in Relation to Gibberellin Signaling Molecules.
A. Gomez-Cadenas, R. Zentella, M. K. Walker-Simmons, and T.-H. D. Ho (2001)
PLANT CELL 13, 667-679
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KAT1 is not essential for stomatal opening.
A. Szyroki, N. Ivashikina, P. Dietrich, M. R. G. Roelfsema, P. Ache, B. Reintanz, R. Deeken, M. Godde, H. Felle, R. Steinmeyer, et al. (2001)
PNAS 98, 2917-2921
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