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The Role of MAPK Modules and ABA during Abiotic Stress Signaling
Axel de Zelicourt1, Jean Colcombet2, Heribert Hirt3
14700 King Abdullah University of Sciences and Technology, KAUST, Thuwal 23955-6900, Saudi Arabia.
Abstract:
To respond to abiotic stresses, plants have developed specific mechanisms that allow them to rapidly perceive and respond to environmental changes. The phytohormone abscisic acid (ABA) was shown to be a pivotal regulator of abiotic stress responses in plants, triggering major changes in plant physiology. The ABA core signaling pathway largely relies on the activation of SnRK2 kinases to mediate several rapid responses, including gene regulation, stomatal closure, and plant growth modulation. Mitogen-activated protein kinases (MAPKs) have also been implicated in ABA signaling, but an entire ABA-activated MAPK module was uncovered only recently. In this review, we discuss the evidence for a role of MAPK modules in the context of different plant ABA signaling pathways.
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