Senescence acceleration
nounPronunciation: /səˈnesəns ˌækseləˈreɪʃən/
The premature or stress-induced progression of leaf aging and cell death processes driven by environmental stress factors. This programmed cell death mechanism diverts resources from stressed tissues to support reproductive or surviving plant organs.
Plain English
Environmental stress causes plant leaves and tissues to age and die faster than normal to conserve resources.
Etymology & History
Usage
"Senescence acceleration under drought conditions allows plants to reallocate nitrogen from dying leaves to developing reproductive tissues."
Style guide notes: Clarify whether senescence is stress-induced or natural age-related; context determines physiological mechanism and resource management implications.
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Contrasted with
Related Terms
Frequently Asked Questions
Why do plants accelerate senescence under stress?
Accelerated senescence conserves water and nutrients by shutting down metabolically expensive tissues, redirecting these resources to reproduction and survival.
What signals trigger stress-induced senescence?
Ethylene hormone, low nutrient availability, reduced water status, and oxidative stress collectively trigger accelerated leaf senescence responses.
Why Test Candidates on This?
Important for understanding stress-survival strategies and predicting crop productivity losses under environmental constraints.
Required skill level: Senior