membrane lipid composition alteration
nounPronunciation: /ˈmɛmbreɪn ˈlɪpɪd ˌkɒmpəˈzɪʃən ˌɔːltərˈeɪʃən/
The stress-induced remodeling of plant cell membrane lipids, including changes in saturation levels, fatty acid chain lengths, and sterol content to maintain membrane fluidity and integrity under temperature and osmotic stress. This adaptive lipidome adjustment is critical for preserving membrane function during unfavorable environmental conditions.
Plain English
Changes in the fatty acids and other fats that make up plant cell membranes, allowing them to stay flexible during temperature or drought stress.
Etymology & History
Usage
"Cold-acclimated plants exhibit membrane lipid composition alteration, increasing polyunsaturated fatty acids to maintain membrane fluidity."
Style guide notes: Specify lipid types affected (phospholipids, glycolipids, sterols) and include enzyme names (desaturases, acyl-CoA synthetases) for precision.
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Frequently Asked Questions
How do plants change membrane lipids during cold stress?
Plants increase unsaturated fatty acid content through desaturase enzyme activity, keeping membranes flexible at low temperatures.
Why is membrane fluidity important under abiotic stress?
Proper membrane fluidity maintains protein function, nutrient transport, and cellular signaling essential for stress survival.
Why Test Candidates on This?
Relevant for advanced plant biochemistry and cell biology courses emphasizing molecular mechanisms of stress tolerance.
Required skill level: Senior