Photosynthetic Limitation
nounPronunciation: /ˌfoʊtəsɪnˈθɛtɪk ˈlɪməˈteɪʃən/
The reduction in photosynthetic capacity caused by non-stomatal factors such as enzyme deactivation, chlorophyll degradation, or thylakoid damage under abiotic stress. This mechanism represents direct damage to photosynthetic machinery independent of stomatal conductance constraints.
Plain English
Direct damage to a plant's photosynthetic system that reduces energy production under stress.
Etymology & History
Usage
"Under severe heat stress, photosynthetic limitation due to Rubisco inactivation occurs independently of stomatal closure."
Style guide notes: Always specify whether limitation is to light reactions or dark reactions; use A/Ci curves for quantification.
Also known as
Contrasted with
Related Terms
Frequently Asked Questions
How is photosynthetic limitation distinguished from stomatal limitation?
Photosynthetic limitation involves biochemical damage; stomatal limitation involves reduced gas access to healthy cells.
What causes photosynthetic limitation in heat stress?
Enzyme inactivation, photosystem II damage, and disruption of electron transport pathways under high temperatures.
Why Test Candidates on This?
Discriminates between stomatal and non-stomatal stress responses in gas exchange analysis.
Required skill level: Senior