Abscisic acid signaling pathway
noun phrasePronunciation: /ˌæbˈsɪsɪk ˈæsɪd ˈsɪɡnəlɪŋ ˈpæðweɪ/
The cascade of molecular events initiated by abscisic acid (ABA) binding to receptors, triggering gene expression and physiological responses that enable plants to tolerate abiotic stress. This pathway involves multiple signaling intermediates including phosphatases, kinases, and transcription factors.
Plain English
The chemical communication system plants use to respond to stress signals through hormone messaging.
Etymology & History
Usage
"The abscisic acid signaling pathway activates stress-responsive genes that encode protective proteins under drought conditions."
Style guide notes: Always distinguish between ABA perception, transduction, and gene expression phases when describing mechanisms.
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Frequently Asked Questions
How does ABA signaling help plants survive drought?
ABA activates genes for osmolyte production and stomatal regulation, reducing water loss while maintaining metabolism.
What are key components of the ABA signaling pathway?
ABA receptors, protein kinases, phosphatases, and transcription factors coordinate the complete stress response cascade.
Why Test Candidates on This?
Essential topic in molecular plant physiology assessments and abiotic stress mechanism evaluations.
Required skill level: Senior