期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
卷 218, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotobiol.2021.112182
关键词
Chlorophyll fluorescence; Kautsky kinetics; Non-photochemical quenching; NPQ components; OJIP; Photosynthesis; PSII; Variable fluorescence; Xanthophyll cycle
资金
- University of Buenos Aires [UBACyT20020130100166BA, UBACyT20020170100037BA]
- Agencia Nacional de Promocion Cientifica y Tecnologica [PICT 20122357]
- CONICET
The research examines the effects of sub-optimal illumination on three plant species by studying chlorophyll fluorescence. The findings show that low light treatment increases pigment content and maintains fluorescence ratios, suggesting conservation of photosystems stoichiometry. Different plant species respond differently to low light, with L. sativa adapting, A. hybridus not significantly stressed, and S. dendroideum decreasing antenna size but increasing quantum yield of primary photochemistry.
The fluorescence signals emitted by chlorophyll molecules of plants is a promising non-destructive indicator of plant physiology due to its close link to photosynthesis. In this work, a deep photophysical study of chlorophyll fluorescence was provided, to assess the sub-optimal illumination effects on three plant species: L. sativa, A. hybridus and S. dendroideum. In all the cases, low light (LL) treatment induced an increase in pigment content. Fluorescence ratios - corrected by light reabsorption processes - remained constant, which suggested that photosystems stoichiometry was conserved. For all species and treatments, quantum yields of photophysical decay remained around 0.2, which meant that the maximum possible photosynthesis efficiency was about 0.8. L. sativa (C3) acclimated to low light illumination, displayed a strong increase in the LHC size and a net decrease in the photosynthetic efficiency. A. hybridus (C4) was not appreciably stressed by the low light availability whereas S. dendroideum (CAM), decreased its antenna and augmented the quantum yield of primary photochemistry. A novel approach to describe NPQ relaxation kinetics was also presented here and used to calculate typical deactivation times and amplitudes for NPQ components. LL acclimated L. sativa presented a much larger deactivation time for its state-transition-related quenching than the other species. Comprehensive fluorescence analysis allowed a deep study of the changes in the light-dependent reactions of photosynthesis upon low light illumination treatment.
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