Leaf senescence
nounPronunciation: /liːf sɪˈnesəns/
The programmed developmental process of leaf aging and decline involving chlorophyll degradation, nutrient reallocation, and eventual abscission or necrosis. Environmental stresses like drought or nutrient deficiency can accelerate leaf senescence as an adaptive response.
Plain English
The natural aging and death of leaves, which plants can speed up in response to stress.
Etymology & History
Usage
"Heat stress accelerates leaf senescence, reducing the plant's photosynthetic capacity and overall productivity."
Style guide notes: Use lowercase 'leaf senescence' except at sentence start; plural is 'senescences' when referring to multiple events.
Also known as
Contrasted with
Related Terms
Frequently Asked Questions
Why does stress accelerate leaf senescence?
Stress triggers nutrient reallocation from damaged leaves to younger tissues, conserving resources for continued growth and survival.
What happens to nutrients during leaf senescence?
Plants retrieve valuable nitrogen, phosphorus, and other elements from senescing leaves before abscission, recycling them for new growth.
Why Test Candidates on This?
Important for crop yield assessment, understanding stress responses, and predicting plant performance under multiple environmental pressures.
Required skill level: Mid