Photosynthetic Limitation Under Stress
nounPronunciation: /ˌfoʊtəʊˌsɪnθɛtɪk ˌlɪmɪˈteɪʃən əndər strɛs/
The reduction in photosynthetic rate and efficiency caused by stress-induced impairment of light capture, electron transport, or carbon fixation pathways. Can be classified as stomatal (due to reduced CO₂ availability) or non-stomatal (biochemical damage).
Plain English
The decrease in the plant's ability to convert light energy into chemical energy when exposed to environmental stress.
Etymology & History
Usage
"Photosynthetic limitation under heat stress results from both reduced stomatal conductance and impaired Rubisco activity."
Style guide notes: Always specify measurement conditions and whether limitation is stomatal or non-stomatal when reporting values.
Also known as
Contrasted with
Related Terms
Frequently Asked Questions
How can we distinguish stomatal from non-stomatal photosynthetic limitation?
A/Ci curves show limitation type: non-stomatal if photosynthesis remains low despite elevated intercellular CO₂ concentration.
Why is photosynthetic limitation important for crop yields?
Reduced photosynthesis directly decreases biomass and grain yield, making it critical for stress-tolerant variety development.
Why Test Candidates on This?
Critical parameter for evaluating stress tolerance mechanisms and predicting crop performance under drought, heat, or cold stress.
Required skill level: Senior