Abscisic acid signal transduction cascade
nounPronunciation: /ˌæbˈsɪsɪk ˈæsɪd ˈsɪɡnəl trænzˈdʌkʃən kæˈkeɪd/
The sequential molecular signaling pathway initiated by abscisic acid (ABA) hormone binding to cell surface receptors, triggering downstream gene expression and metabolic changes that coordinate plant stress responses. This cascade regulates stomatal closure, root growth redirection, and stress-protective protein synthesis.
Plain English
The cell signaling chain that plants use when stress hormone ABA tells cells to activate protective stress responses.
Etymology & History
Usage
"The abscisic acid signal transduction cascade was activated within 15 minutes of drought stress exposure in Arabidopsis leaves."
Style guide notes: Include specific PYR/PYL receptor types and downstream kinases (SnRK2) when describing molecular mechanisms in research contexts.
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Frequently Asked Questions
How does ABA initiate stress responses in plants?
ABA binds to PYR/PYL receptors, triggering phosphorylation cascades that activate stress-response genes and metabolic pathways.
What outcomes result from ABA signal transduction?
ABA signaling induces stomatal closure, increases root growth, and upregulates protective proteins and osmoprotectants.
Why Test Candidates on This?
Essential topic for molecular biology and plant physiology assessments covering stress hormone mechanisms and signal integration.
Required skill level: Senior