Cell Wall Extensibility Index
nounPronunciation: /sɛl wɔːl ɪkˌstɛnsɪˈbɪlɪti ˈɪndɛks/
A quantitative measure of the degree to which cell walls can stretch and deform under turgor pressure, calculated from the ratio of actual cell expansion to potential expansion under optimal hydration. High extensibility indicates walls that yield easily to growth forces, enabling rapid cell elongation.
Plain English
A measurement of how much a plant cell's wall can stretch and allow the cell to grow larger.
Etymology & History
Usage
"Under salt stress, the cell wall extensibility index decreased significantly, restricting cell elongation and reducing overall plant height."
Style guide notes: Distinguish between elastic and plastic deformation components when reporting cell wall extensibility measurements.
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Frequently Asked Questions
What factors reduce cell wall extensibility?
Salt stress, water deficit, low temperature, and increased cell wall crosslinking through lignification reduce extensibility.
Why is extensibility important for stress tolerance?
High extensibility allows continued growth under mild stress; reduced extensibility is a stress symptom limiting productivity.
Why Test Candidates on This?
Relevant for plant physiology assessments evaluating cellular-level growth responses to environmental constraints.
Required skill level: Mid