Abscisic acid (ABA) accumulation
nounPronunciation: /ˌæbsɪsɪk ˈæsɪd əˈkjuːmjəˈleɪʃən/
The increased biosynthesis and cellular concentration of abscisic acid, a plant hormone that mediates stress-responsive gene expression and physiological adjustments. ABA accumulation triggers stomatal closure, inhibits growth, and activates protective mechanisms in response to environmental constraints.
Plain English
The buildup of a stress hormone that helps plants cope with water scarcity and other environmental challenges.
Etymology & History
Usage
"ABA accumulation in root tissues precedes visible wilting, allowing early drought stress detection."
Style guide notes: Use full name on first mention; abbreviate as ABA thereafter.
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Frequently Asked Questions
What triggers ABA accumulation in plants?
Water deficit, salinity stress, cold, and other environmental stressors rapidly increase ABA biosynthesis.
How does ABA accumulation protect plants?
ABA closes stomata to conserve water and activates genes for stress proteins and compatible solutes.
Why Test Candidates on This?
Critical for understanding plant hormone signaling and molecular mechanisms of stress tolerance.
Required skill level: Mid