Xylem Tension Increase
noun phrasePronunciation: /ˈzaɪləm ˈtenʃən ɪnˈkriːs/
The elevation of negative pressure (increased tension) in the xylem sap during water deficit stress, which facilitates water transport but increases cavitation risk. Higher xylem tension occurs as plants maintain water uptake against reduced soil water availability.
Plain English
During drought, water in plant vessels experiences greater negative pressure, helping transport water upward but risking vessel breakage.
Etymology & History
Usage
"Xylem tension increase during severe drought can exceed plant hydraulic limits and trigger vessel failure."
Style guide notes: Use 'xylem tension' rather than 'negative pressure' when referring specifically to water column stress.
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Contrasted with
Related Terms
Frequently Asked Questions
Why does xylem tension increase during water deficit?
Plants maintain transpiration despite lower soil water availability, creating stronger negative pressure gradients.
What happens if xylem tension becomes too extreme?
Excessive tension can cause air bubble formation and xylem vessel embolism, disrupting water transport.
Why Test Candidates on This?
Important for understanding plant hydraulic failure mechanisms and drought resistance strategies.
Required skill level: Mid