abscisic acid (ABA) signaling cascade
nounPronunciation: /æbˈsɪzɪk ˈæsɪd ˈsɪɡnəlɪŋ kæˈskeɪd/
The intracellular signal transduction pathway triggered by abscisic acid hormones, involving receptor activation, second messengers, and transcription factor phosphorylation to induce stress-responsive gene expression. This cascade coordinates plant responses to drought, cold, and salt stress through regulated stomatal closure and metabolic adjustments.
Plain English
A chemical signaling pathway in plants that activates stress responses when hormone ABA binds to cell receptors.
Etymology & History
Usage
"The ABA signaling cascade activates DREB transcription factors, inducing expression of drought-responsive genes in maize roots."
Style guide notes: Always write 'ABA signaling cascade' rather than 'ABA cascade' in formal contexts for clarity.
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Frequently Asked Questions
What are the main components of ABA signaling cascade?
ABA receptors (PYL/RCAR proteins), protein phosphatase 2C inhibition, SnRK2 kinase activation, and phosphorylation of transcription factors.
How does ABA signaling improve drought tolerance?
ABA cascade promotes stomatal closure, reduces water loss, and activates genes producing osmolytes and protective proteins.
Why Test Candidates on This?
Highly relevant in plant molecular biology and stress physiology advanced examinations.
Required skill level: Senior