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Cross-Talk in Abscisic Acid Signaling

Nina V. Fedoroff
Science's STKE • 9 Jul 2002 • Vol 2002, Issue 140 • p. re10 • DOI: 10.1126/stke.2002.140.re10
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Abstract

"Cross-talk" in hormone signaling reflects an organism's ability to integrate different inputs and respond appropriately, a crucial function at the heart of signaling network operation. Abscisic acid (ABA) is a plant hormone involved in bud and seed dormancy, growth regulation, leaf senescence and abscission, stomatal opening, and a variety of plant stress responses. This review summarizes what is known about ABA signaling in the control of stomatal opening and seed dormancy and provides an overview of emerging knowledge about connections between ABA, ethylene, sugar, and auxin synthesis and signaling.

Abstract

Abscisic acid (ABA) is a plant hormone that regulates such processes as seed and bud dormancy and the senescence (aging) and abscission (dropping off) of leaves. It is also important for a plant's ability to respond rapidly to water loss by closing leaf stomata (pores), as well as to other stressful environmental conditions. In this review, Federoff summarizes what is known about how ABA signals are perceived and transmitted within a plant. Federoff then discusses how the ABA signaling system is interconnected with signaling systems in plants that use sugars, and other hormones, such as ethylene and auxin. Interconnections or "cross-talk" between signaling systems allows the plant to integrate information from a variety of sources and adjust appropriately to ambient conditions.
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I thank M. Blatt, N. -H. Chua, J. Schroeder, and F. Sutton for their critical reading of this manuscript.

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Volume 2002 | Issue 140
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Nina V. Fedoroff
Biotechnology Institute, Life Sciences Consortium, and Biology Department, Pennsylvania State University, University Park, PA 16802, USA.
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