Root-to-shoot signaling
nounPronunciation: /ruːt tuː ʃuːt ˈsɪɡnəlɪŋ/
The long-distance chemical communication system through which roots detect abiotic stress signals and transmit information to aerial tissues, modulating growth and physiological responses without immediate local water stress. This system involves transport of hormones, ions, and other signaling molecules through the xylem stream.
Plain English
The system allowing plant roots to send chemical messages to leaves and stems about environmental stress conditions.
Etymology & History
Usage
"Root-to-shoot signaling enables plants to pre-emptively reduce leaf growth and transpiration before severe water stress develops."
Style guide notes: Hyphenate 'root-to-shoot' when used as a modifier before nouns (e.g., 'root-to-shoot signals').
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Frequently Asked Questions
What signals are transported in root-to-shoot communication?
Abscisic acid, cytokinins, calcium ions, and pH changes in xylem sap serve as major root-derived stress signals.
How does this help plant survival?
Root signals allow shoots to adjust before experiencing severe stress, preventing excessive water loss and damage.
Why Test Candidates on This?
Essential for understanding how plants coordinate stress responses across organs in abiotic stress physiology assessments.
Required skill level: Mid