Membrane integrity index
noun phrasePronunciation: /məˈbreɪn ɪnˈtɛɡrɪti ˈɪndɛks/
A quantitative measure of plasma and organellar membrane structural stability, typically assessed through electrolyte leakage assays or lipid peroxidation markers under abiotic stress. Higher values indicate better preservation of membrane phospholipid bilayers and selective permeability.
Plain English
A measure of how well plant cell membranes stay intact and functional under stress conditions.
Etymology & History
Usage
"Membrane integrity index declined significantly in heat-stressed wheat leaves, indicating cellular damage progression."
Style guide notes: When reporting data, specify measurement method (electrolyte leakage vs. MDA content) for transparency.
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Frequently Asked Questions
How is membrane integrity index measured experimentally?
Through relative electrolyte leakage assays comparing conductivity before and after heat treatment of leaf samples.
Why is membrane integrity important for stress tolerance?
Intact membranes maintain ion homeostasis, cellular compartmentalization, and prevent protein denaturation and ion toxicity.
Why Test Candidates on This?
Frequently used in plant stress physiology labs and evaluations assessing tolerance mechanisms in crop improvement studies.
Required skill level: Mid