abscisic acid signaling cascade
nounPronunciation: /ˌæbsˈsɪsɪk ˈæsɪd ˈsɪɡnəlɪŋ kæˈskeɪd/
The intracellular signal transduction pathway initiated by abscisic acid (ABA) binding to its receptors, triggering downstream responses including stomatal closure, gene expression changes, and metabolic reprogramming. This cascade integrates multiple stress signals and coordinates plant drought and cold responses.
Plain English
The series of molecular events inside plant cells that occur when the stress hormone ABA attaches to cell receptors and triggers protective responses.
Etymology & History
Usage
"The abscisic acid signaling cascade is disrupted in certain mutant lines, resulting in constitutive drought sensitivity."
Style guide notes: Distinguish between ABA synthesis, perception, and signaling; avoid conflating ABA levels with signaling cascade activation.
Also known as
Related Terms
Frequently Asked Questions
What triggers the abscisic acid signaling cascade?
Water stress causes ABA accumulation in root cells, which bind to PYR/PYL/RCAR receptors on the cell membrane initiating cascade.
How long does the abscisic acid signaling cascade take to produce effects?
Rapid responses (stomatal closure) occur within minutes; gene expression changes require 30 minutes to several hours.
Why Test Candidates on This?
Highly tested in molecular plant physiology exams and central to transgenic crop development for drought tolerance.
Required skill level: Mid