Proline accumulation index
noun phrasePronunciation: /ˈproʊliːn əˌkjuːmjəˈleɪʃən ˈɪndɛks/
A quantitative measurement of proline concentration changes in plant tissues under abiotic stress conditions, expressed relative to control levels or as absolute amino acid content per unit biomass. This index serves as a biochemical indicator of osmotic adjustment capability and stress intensity in plant tissues.
Plain English
A numerical measure of how much proline amino acid builds up in plants when they experience stress.
Etymology & History
Usage
"The proline accumulation index increased five-fold in drought-stressed wheat leaves, indicating substantial osmotic adjustment responses."
Style guide notes: Clarify whether index represents fold-change ratios or absolute concentrations to prevent misinterpretation of results.
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Frequently Asked Questions
Why do plants accumulate proline under stress?
Proline functions as an osmolyte reducing water potential, a compatible solute preventing protein denaturation, and an antioxidant.
How is the proline accumulation index measured in research?
Typically measured using chromatography techniques like HPLC or GC-MS on extracted plant tissue samples.
Why Test Candidates on This?
Commonly assessed in plant biochemistry exams and drought physiology research methods.
Required skill level: Mid