Abscisic acid signaling
nounPronunciation: /æbˈsɪsɪk ˈæsɪd ˈsɪɡnəlɪŋ/
The biochemical cascade initiated by the plant hormone abscisic acid that regulates stress responses, including stomatal closure and gene expression changes. This signaling pathway coordinates multiple adaptive responses to environmental constraints.
Plain English
The chemical messaging system plants use via hormone abscisic acid to respond to stress conditions.
Etymology & History
Usage
"Abscisic acid signaling coordinates rapid stomatal closure within minutes of detecting soil water deficit."
Style guide notes: Use ABA as abbreviation only after first complete spelling; maintain consistency within documents.
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Frequently Asked Questions
How quickly does abscisic acid signaling activate in stressed plants?
Initial stomatal responses occur within minutes, while full adaptive responses develop over hours.
What downstream proteins does ABA signaling regulate?
Key proteins include ion channels, kinases, and transcription factors controlling stress-protective gene activation.
Why Test Candidates on This?
Fundamental for understanding molecular mechanisms of plant stress adaptation and protective responses.
Required skill level: Senior