Abscisic acid (ABA) signaling pathway
noun phrasePronunciation: /æbˈsɪsɪk ˈæsɪd ˈsɪɡnəlɪŋ ˈpæðweɪ/
The cascade of molecular events initiated by abscisic acid hormone binding to cellular receptors, which regulates multiple stress-responsive processes including stomatal closure, gene expression, and metabolic adjustments. ABA signaling integrates multiple stress signals and coordinates plant adaptation responses.
Plain English
A hormone-triggered cellular communication system that activates stress-defense mechanisms like closing leaf pores and altering gene expression.
Etymology & History
Usage
"The abscisic acid signaling pathway mediates rapid stomatal closure responses to drought stress within minutes."
Style guide notes: Use 'ABA signaling pathway' or 'ABA-dependent signaling' depending on context; avoid redundancy with 'abscisic acid ABA' simultaneously.
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Frequently Asked Questions
What is the primary role of abscisic acid in stress response?
ABA coordinates multiple adaptive responses including stomatal closure, ion accumulation, and activation of protective genes.
How does ABA signaling differ from other plant hormone pathways?
ABA is unique in integrating multiple stress signals and directly activating immediate protective responses like stomatal closure.
Why Test Candidates on This?
ABA signaling is essential knowledge in plant stress physiology and molecular responses to abiotic stress.
Required skill level: Senior