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Function of ABA in Stomatal Defense against Biotic and Drought Stresses

Department of Life Science (BK21 program), Chung-Ang University, Seoul 156-756, Korea
Department of Home Economics Education, Chung-Ang University, Seoul 156-756, Korea
Authors to whom correspondence should be addressed.
Academic Editors: Ann Cuypers and Tony Remans
Int. J. Mol. Sci. 2015, 16(7), 15251-15270;
Received: 28 May 2015 / Revised: 30 June 2015 / Accepted: 2 July 2015 / Published: 6 July 2015
(This article belongs to the Special Issue Abiotic Stress and Gene Networks in Plants)
PDF [1188 KB, uploaded 6 July 2015]


The plant hormone abscisic acid (ABA) regulates many key processes involved in plant development and adaptation to biotic and abiotic stresses. Under stress conditions, plants synthesize ABA in various organs and initiate defense mechanisms, such as the regulation of stomatal aperture and expression of defense-related genes conferring resistance to environmental stresses. The regulation of stomatal opening and closure is important to pathogen defense and control of transpirational water loss. Recent studies using a combination of approaches, including genetics, physiology, and molecular biology, have contributed considerably to our understanding of ABA signal transduction. A number of proteins associated with ABA signaling and responses—especially ABA receptors—have been identified. ABA signal transduction initiates signal perception by ABA receptors and transfer via downstream proteins, including protein kinases and phosphatases. In the present review, we focus on the function of ABA in stomatal defense against biotic and abiotic stresses, through analysis of each ABA signal component and the relationships of these components in the complex network of interactions. In particular, two ABA signal pathway models in response to biotic and abiotic stress were proposed, from stress signaling to stomatal closure, involving the pyrabactin resistance (PYR)/PYR-like (PYL) or regulatory component of ABA receptor (RCAR) family proteins, 2C-type protein phosphatases, and SnRK2-type protein kinases. View Full-Text
Keywords: abscisic acid (ABA); ABA receptor; biotic and abiotic stresses; PP2C; SnRK2; stomatal immunity abscisic acid (ABA); ABA receptor; biotic and abiotic stresses; PP2C; SnRK2; stomatal immunity

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Lim, C.W.; Baek, W.; Jung, J.; Kim, J.-H.; Lee, S.C. Function of ABA in Stomatal Defense against Biotic and Drought Stresses. Int. J. Mol. Sci. 2015, 16, 15251-15270.

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