Heat stress-induced premature senescence
nounPronunciation: /hiːt strɛs ɪnˈdjuːst prɪˈmeɪtʃər ˌsɛnɛˈsɛns/
Accelerated leaf aging and programmed cell death triggered by exposure to supra-optimal temperatures, characterized by chlorophyll degradation and loss of photosynthetic capacity. This response diverts resources from growth to stress survival mechanisms.
Plain English
Leaves age and die prematurely when plants are exposed to excessive heat, causing them to lose their ability to photosynthesize.
Etymology & History
Usage
"Heat stress-induced premature senescence reduced grain fill period in wheat grown under elevated temperature regimes."
Style guide notes: Distinguish between developmentally programmed senescence and stress-induced senescence in all scientific discussions.
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Related Terms
Frequently Asked Questions
Why do plants senesce prematurely under heat stress?
Plants redirect resources from growth to protective mechanisms and seed production to maximize reproductive success under stress.
What are visible signs of heat stress-induced premature senescence?
Chlorophyll loss, yellowing leaves, reduced leaf area, and early leaf abscission indicate premature senescence progression.
Why Test Candidates on This?
Commonly tested in climate change impact studies and crop physiology assessments.
Required skill level: Mid