Leaf senescence acceleration
nounPronunciation: /liːf ˌsenɛsəns ækˈsɛləreɪʃən/
The premature or enhanced degradation of leaf tissues and nutrient reallocation triggered by abiotic stresses such as drought, heat, or nutrient deficiency. This process involves coordinated disassembly of chloroplasts, protein breakdown, and mobilization of nitrogen and other mobile nutrients to support survival of other plant organs.
Plain English
The speeding up of leaf aging and nutrient recycling in response to environmental stress conditions.
Etymology & History
Usage
"Leaf senescence acceleration under drought stress enables plants to recover nutrient investments and reduce transpirational water loss from doomed tissues."
Style guide notes: Emphasize the controlled, resource-recovering nature of stress-induced senescence to distinguish from damage; note distinction from constitutive senescence.
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Related Terms
Frequently Asked Questions
Why do plants accelerate leaf senescence under stress?
Rapid senescence redirects resources from dying leaves to roots and reproductive tissues, improving short-term survival probability.
What happens to chlorophyll during accelerated senescence?
Chlorophyll is broken down into nitrogen-rich amino acids and other compounds that are transported to actively growing tissues.
Why Test Candidates on This?
Commonly tested in plant physiology to assess understanding of stress adaptation and resource allocation strategies.
Required skill level: Mid