Abscisic acid (ABA) signaling
nounPronunciation: /ˌæbsɪsɪk ˈæsɪd ˈsɪɡnəlɪŋ/
The signal transduction pathway involving the plant hormone abscisic acid, which mediates stress responses including stomatal regulation, gene expression, and growth inhibition under adverse conditions. ABA signaling integrates multiple stress signals to coordinate plant defense mechanisms.
Plain English
A chemical messaging system in plants where the hormone abscisic acid triggers protective responses when the plant faces stress like drought or cold.
Etymology & History
Usage
"ABA signaling cascades were activated within 30 minutes of osmotic stress application, triggering rapid physiological adaptations."
Style guide notes: Use full term 'abscisic acid signaling' on first mention; subsequent references may use 'ABA signaling' or 'ABA pathway'.
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Frequently Asked Questions
How does ABA signaling protect plants from drought?
ABA activates genes for stress tolerance, promotes stomatal closure to reduce water loss, and triggers osmotic adjustment in cells.
What are the main components of ABA signal transduction?
Key components include ABA receptors (PYR/PYL proteins), PP2C phosphatases, SnRK2 kinases, and downstream transcription factors.
Why Test Candidates on This?
High priority in plant physiology and molecular biology examinations focused on stress mechanisms.
Required skill level: Mid