Cavitation resistance threshold
nounPronunciation: /ˌkævɪˈteɪʃən rɪˈzɪstəns ˈθreʃhoʊld/
The minimum water potential (most negative value) at which a plant organ, typically the xylem, can function without experiencing irreversible air embolism formation that disrupts water transport. This threshold varies among species and represents a critical stress tolerance limit.
Plain English
The driest water conditions a plant's water-conducting tissues can withstand before air bubbles form and block water transport.
Etymology & History
Usage
"Species with higher cavitation resistance thresholds demonstrated superior survival during extreme drought events compared to drought-sensitive varieties."
Style guide notes: Report cavitation resistance thresholds in megapascals (MPa) and compare across species contexts.
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Related Terms
Frequently Asked Questions
What causes cavitation in plant xylem?
Excessive negative water potentials during drought cause water columns to break, allowing air to enter vessels and form gas bubbles.
How do plants with high cavitation resistance achieve this?
They have specialized xylem anatomy with smaller vessel diameters and reinforced pit membranes that resist air bubble formation.
Why Test Candidates on This?
Critical for understanding physiological limits of plant water transport under severe drought conditions.
Required skill level: Senior