senescence acceleration factor
nounPronunciation: /sɪˈnesəns ækˌseləˈreɪʃən ˈfæktə/
A quantitative parameter describing the rate at which abiotic stress conditions (drought, heat, salinity) advance leaf senescence beyond normal developmental schedules. This stress-induced aging can significantly reduce the grain-filling period and yield in crop plants.
Plain English
A measure of how much faster plants age their leaves when exposed to environmental stresses like drought or heat.
Etymology & History
Usage
"Heat-stressed wheat genotypes showed a senescence acceleration factor of 2.3, maturing 10 days earlier than unstressed controls."
Style guide notes: Always specify the stress type and intensity when reporting values, as the acceleration factor is highly stress-dependent and cultivar-specific.
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Related Terms
Frequently Asked Questions
How is senescence acceleration factor measured?
Compare leaf greenness decline rates between stressed and control plants using chlorophyll content or remote sensing indices.
Why does stress accelerate senescence?
Plants redirect resources from vegetative growth to defense, seed production, or survival mechanisms when stressed.
Why Test Candidates on This?
Critical for predicting yield penalties under climate stress and identifying genotypes with delayed senescence for climate-adaptive breeding programs.
Required skill level: Expert