abscisic acid accumulation
nounPronunciation: /ˌæbˈsɪsɪk ˈæsɪd əˈkjuːmjəˌleɪʃən/
The increase in concentration of abscisic acid (ABA), a phytohormone that accumulates in plant tissues during abiotic stress conditions. This hormone triggers physiological and molecular responses including stomatal closure, gene expression changes, and osmolyte synthesis.
Plain English
The buildup of a plant hormone that signals stress conditions and triggers protective responses like closing leaf pores.
Etymology & History
Usage
"ABA accumulation in roots exposed to drought triggers signaling cascades that close stomata before visible wilting occurs."
Style guide notes: Refer to the hormone by full name on first mention, then abbreviate as ABA thereafter.
Also known as
Related Terms
Frequently Asked Questions
What triggers abscisic acid accumulation?
Water deficit, cold, salinity, and other stresses trigger rapid ABA synthesis and accumulation in plant tissues.
How does ABA accumulation protect plants?
ABA closes stomata, promotes osmolyte synthesis, and activates stress response genes to enhance stress tolerance.
Why Test Candidates on This?
Critical for understanding stress signal perception and the molecular basis of plant stress responses.
Required skill level: Mid