Xylem Cavitation Embolism
noun phrasePronunciation: /ˈzaɪləm kævɪˈteɪʃən ɛmˈboʊlɪzəm/
The formation of air-filled gaps in xylem vessels that interrupts water column continuity and prevents hydraulic transport from roots to shoots. This phenomenon occurs when xylem water potential drops below the air-entry threshold, disrupting vascular function and plant water availability.
Plain English
Air bubbles that form in plant water-conducting vessels, blocking water transport from roots to leaves.
Etymology & History
Usage
"Severe drought can trigger xylem cavitation embolism, effectively severing the hydraulic connection between root and canopy systems."
Style guide notes: Use 'cavitation' alone when context is clearly xylem-related; specify 'embolism' for air-blockage emphasis.
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Related Terms
Frequently Asked Questions
Why does xylem cavitation occur during drought?
Extreme water stress causes xylem pressure to drop below air-entry thresholds, allowing air into vessels and breaking water columns.
Can plants recover from xylem cavitation?
Partial recovery occurs through refilling mechanisms, but complete recovery requires water potential restoration and pressure chamber reopening.
Why Test Candidates on This?
Critical in drought resilience evaluation and crop vulnerability assessment studies.
Required skill level: Mid