Integration of Abscisic Acid Signalling into Plant Responses

A. Christmann; D. Moes; A. Himmelbach; Y. Yang; Y. Tang; E. Grill

doi:10.1055/s-2006-924120

Plant Biology, Table of Contents

Plant Biol (Stuttg) 2006; 8(3): 314-325
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. Grill¹

¹Lehrstuhl für Botanik, Technische Universität München, Am Hochanger 4, 85354 Freising, Germany

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.

Full Text

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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