Photosynthetic Electron Transport Rate
nounPronunciation: /ˌfoʊtəsɪnˈθɛtɪk ɪˈlɛktrɑn ˈtrænspɔrt reɪt/
The rate of electron movement through photosystem complexes (PSII to PSI) during the light reactions, measurable via chlorophyll fluorescence. This parameter indicates photosynthetic efficiency and stress-induced photoinhibition.
Plain English
The speed at which electrons move through light-harvesting systems in photosynthesis, indicating photosynthetic health.
Etymology & History
Usage
"Photosynthetic electron transport rate declined by 40% in heat-stressed maize leaves compared to controls."
Style guide notes: Specify measurement wavelength and light intensity; distinguish relative from absolute ETR values.
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Related Terms
Frequently Asked Questions
How is photosynthetic electron transport rate measured experimentally?
Chlorophyll fluorescence pulse-amplitude modulation (PAM) measures PSII quantum yield and calculates ETR from light intensity.
What causes electron transport rate to decrease under abiotic stress?
Stress damages photosystem II reaction centers and impairs electron transfer through thylakoid membrane complexes.
Why Test Candidates on This?
Standard physiological measurement in stress tolerance screening and photosynthetic capacity assessments.
Required skill level: Mid