Freeze-thaw mechanical rupture
nounPronunciation: /ˈfriːz θɔː mɪˈkænɪkəl ˈrʌptʃər/
Physical cell damage resulting from ice crystal formation within plant tissues during freezing stress, causing expansion that exceeds cell wall elasticity and ruptures cellular membranes. This process leads to cellular leakage and necrosis upon thawing.
Plain English
Cell damage caused by ice crystals growing inside plants during freezing, breaking cell walls and membranes.
Etymology & History
Usage
"Winter injury in citrus crops often results from freeze-thaw mechanical rupture of xylem and phloem tissues."
Style guide notes: Differentiate from chilling injury, which occurs above freezing; this mechanism requires sub-zero temperatures.
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Frequently Asked Questions
Why do ice crystals rupture plant cells?
Water expands about 9% when freezing; confined in cells, this expansion exceeds wall strength.
How do cold-hardy plants prevent freeze-thaw rupture?
They reduce cell water content and produce antifreeze compounds to lower freezing point.
Why Test Candidates on This?
Important for temperate plant physiology and crop winter survival assessment studies.
Required skill level: Mid