xylem cavitation resistance
nounPronunciation: /ˈzaɪləm ˌkævɪˈteɪʃən rɪˈzɪstəns/
The ability of xylem tissue to withstand negative pressure and resist the formation and spread of air-filled embolisms that disrupt water transport. This trait is determined by vessel wall thickness, pit membrane properties, and wood anatomy and is critical for plant survival under severe drought.
Plain English
The strength of xylem vessels to prevent air bubbles from forming and blocking water transport during severe water stress.
Etymology & History
Usage
"Species with higher xylem cavitation resistance, such as chaparral shrubs, maintain hydraulic conductivity under water potentials below -8 MPa."
Style guide notes: Always specify water potential thresholds (MPa) when reporting cavitation resistance; distinguish from hydraulic efficiency measurements.
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Frequently Asked Questions
How do structural features confer xylem cavitation resistance?
Thicker vessel walls, smaller pit apertures, and reinforced pit membranes resist air entry and embolism spread during low water potentials.
Why is cavitation resistance a trade-off trait in plants?
Vessels with high cavitation resistance have smaller diameters and higher hydraulic resistance, reducing water transport efficiency under optimal conditions.
Why Test Candidates on This?
Advanced assessment topic for research-focused graduate programs studying wood anatomy, drought adaptation, and climate-change impacts on forest species.
Required skill level: Expert