Abscisic acid (ABA)
nounPronunciation: /ˌæbˈsɪzɪk ˈæsɪd/
A plant hormone that regulates stress responses, particularly by promoting stomatal closure and reducing water loss during drought and other abiotic stresses. ABA coordinates the expression of stress-responsive genes and enhances plant survival under unfavorable conditions.
Plain English
A plant hormone that helps plants survive stress by closing pores and controlling water loss.
Etymology & History
Usage
"Abscisic acid accumulation in roots triggers stomatal closure to minimize water loss during water-limited conditions."
Style guide notes: Use abbreviation 'ABA' after first mention; capitalize fully in formal contexts.
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Related Terms
Frequently Asked Questions
What is the primary role of ABA during drought stress?
ABA promotes stomatal closure to prevent water loss through transpiration.
Where is ABA primarily synthesized in plants?
ABA is mainly synthesized in root tissues and transported to shoots.
Why Test Candidates on This?
Essential for understanding plant hormone signaling in stress physiology examinations.
Required skill level: Junior