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Plant Biol (Stuttg) 2006; 8(3): 314-325
DOI: 10.1055/s-2006-924120
DOI: 10.1055/s-2006-924120
Review Article
Georg Thieme Verlag Stuttgart KG · New York
Integration of Abscisic Acid Signalling into Plant Responses[1]
A. Christmann1 , D. Moes1 , A. Himmelbach1 , Y. Yang1 , Y. Tang1 , E. Grill1Further Information
Publication History
Received: December 7, 2005
Accepted: March 24, 2006
Publication Date:
15 May 2006 (online)
Abstract
The phytohormone abscisic acid (ABA) plays a major role as an endogenous messenger in the regulation of plant's water status. ABA is generated as a signal during a plant's life cycle to control seed germination and further developmental processes and in response to abiotic stress imposed by salt, cold, drought, and wounding. The action of ABA can target specifically guard cells for induction of stomatal closure but may also signal systemically for adjustment towards severe water shortage. At the molecular level, the responses are primarily mediated by regulation of ion channels and by changes in gene expression. In the last years, the molecular complexity of ABA signal transduction surfaced more and more. Many proteins and a plethora of “secondary” messengers that regulate or modulate ABA-responses have been identified by analysis of mutants including gene knock-out plants and by applying RNA interference technology together with protein interaction analysis. The complexity possibly reflects intensive cross-talk with other signal pathways and the role of ABA to be part of and to integrate several responses. Despite the missing unifying concept, it is becoming clear that ABA action enforces a sophisticated regulation at all levels.
Key words
Abscisic acid - Arabidopsis - signal transduction - ABA biosynthesis - protein-protein interaction - abiotic stress - in vivo imaging.
1 Financial sources: Deutsche Forschungsgemeinschaft, Fonds der Chemischen Industrie
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1 Financial sources: Deutsche Forschungsgemeinschaft, Fonds der Chemischen Industrie
E. Grill
Lehrstuhl für Botanik
Technische Universität München
Am Hochanger 4
85354 Freising
Germany
Email: grill@wzw.tum.de
Guest Editor: R. Reski