root-to-shoot signal transduction
nounPronunciation: /ˈruːt tə ˈʃuːt ˈsɪɡnəl trænzˈdʌkʃən/
The long-distance chemical communication pathway from root tissues to aerial plant organs mediated primarily by abscisic acid and other hormonal messengers. This signaling enables coordinated whole-plant responses to soil water availability before shoot water status declines critically.
Plain English
The messaging system between plant roots and leaves that coordinates drought responses before water stress becomes severe.
Etymology & History
Usage
"Root-to-shoot signal transduction allows plants to sense soil drying and adjust stomatal conductance before significant leaf dehydration occurs."
Style guide notes: Emphasize the 'long-distance' nature to distinguish from local paracrine signaling within single tissues.
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Contrasted with
Related Terms
Frequently Asked Questions
What primary molecule mediates root-to-shoot signal transduction in drought?
Abscisic acid synthesized in roots travels via xylem to leaves triggering stomatal closure responses.
Why is root-to-shoot signaling advantageous for drought tolerance?
It enables preventative physiological adjustments when soil becomes dry, before shoot water potential drops dangerously.
Why Test Candidates on This?
Key concept in understanding integrated plant stress sensing and whole-organism adaptation mechanisms.
Required skill level: Mid