Abscisic acid-mediated signaling cascade
nounPronunciation: /ˌæbˈsɪzɪk ˈæsɪd ˈmiːdiːeɪtɪd ˈsɪɡnəlɪŋ kæˈskeɪd/
The multi-step intracellular pathway activated by abscisic acid (ABA) binding to receptor proteins, triggering phosphorylation events and calcium mobilization that ultimately regulate stress-response gene expression and physiological adaptations. This cascade coordinates plant responses to drought, cold, and other abiotic stresses.
Plain English
A chain of chemical signals inside plant cells started by the stress hormone abscisic acid that activates protective responses.
Etymology & History
Usage
"The abscisic acid-mediated signaling cascade activated within minutes of osmotic stress, upregulating drought-response genes."
Style guide notes: Always expand 'ABA' on first use; specify which receptor proteins (PYR/PYL/RCAR) when describing mechanistic details.
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Frequently Asked Questions
What are the main steps in the abscisic acid-mediated signaling cascade?
ABA receptor binding, kinase activation, calcium release, transcription factor phosphorylation, and stress-response gene transcription occur sequentially.
How does this cascade help plants survive abiotic stress?
It orchestrates stomatal closure, osmolyte synthesis, and protective enzyme expression that collectively minimize stress damage.
Why Test Candidates on This?
Major assessment focus for molecular plant physiology and signal transduction studies in abiotic stress literature.
Required skill level: Senior