root-to-shoot signaling cascade
nounPronunciation: /ˈruːt tə ˈʃuːt ˈsɪɡnəlɪŋ kæˈskeɪd/
The coordinated sequence of biochemical signals transmitted from roots to shoots during abiotic stress, including abscisic acid transport, hydraulic signals, and root-derived cytokinin depletion. This cascade regulates whole-plant stress responses and resource allocation patterns.
Plain English
Chemical messages sent from plant roots to leaves that tell the plant about water stress and trigger protective responses.
Etymology & History
Usage
"The root-to-shoot signaling cascade elevates shoot abscisic acid levels and triggers stomatal closure before leaf water status declines measurably."
Style guide notes: Identify specific signaling molecules when describing cascade mechanisms; avoid vague 'signals' terminology.
Also known as
Contrasted with
Related Terms
Frequently Asked Questions
What is the primary signal in root-to-shoot signaling during drought?
Abscisic acid transported from roots is the main signal, supplemented by reduced cytokinin transport.
How fast does root-to-shoot signaling occur?
Changes occur within minutes to hours, enabling proactive rather than reactive stress responses.
Why Test Candidates on This?
Frequently tested in plant physiology and stress responses; critical for understanding early stress perception mechanisms.
Required skill level: Senior