Abstract
In this study, we have compared the photosynthetic characteristics of two contrasting species of Tradescantia plants, T. fluminensis (shade-tolerant species), and T. sillamontana (light-resistant species), grown under the low light (LL, 50–125 µmol photons m−2 s−1) or high light (HL, 875–1000 µmol photons m−2 s−1) conditions during their entire growth period. For monitoring the functional state of photosynthetic apparatus (PSA), we measured chlorophyll (Chl) a emission fluorescence spectra and kinetics of light-induced changes in the heights of fluorescence peaks at 685 and 740 nm (F 685 and F 740). We also compared the light-induced oxidation of P700 and assayed the composition of carotenoids in Tradescantia leaves grown under the LL and HL conditions. The analyses of slow induction of Chl a fluorescence (SIF) uncovered different traits in the LL- and HL-grown plants of ecologically contrasting Tradescantia species, which may have potential ecophysiological significance with respect to their tolerance to HL stress. The fluorometry and EPR studies of induction events in chloroplasts in situ demonstrated that acclimation of both Tradescantia species to HL conditions promoted faster responses of their PSA as compared to LL-grown plants. Acclimation of both species to HL also caused marked changes in the leaf anatomy and carotenoid composition (an increase in Violaxanthin + Antheraxantin + Zeaxanthin and Lutein pools), suggesting enhanced photoprotective capacity of the carotenoids in the plants grown in nature under high irradiance. Collectively, the results of the present work suggest that the mechanisms of long-term PSA photoprotection in Tradescantia are based predominantly on the light-induced remodeling of pigment-protein complexes in chloroplasts.
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Abbreviations
- AL:
-
Actinic light
- A:
-
Antheraxanthin
- Car:
-
Carotenoid(s)
- CBC:
-
Calvin–Benson cycle
- Chl:
-
Chlorophyll(s)
- Cyt:
-
Cytochrome
- DCMU:
-
3-(3,4-Dichlorophenyl)-1,10-dimethyl urea
- DE :
-
Xanthophyll de-epoxidation index
- EPR:
-
Electron paramagnetic resonance
- ETC:
-
Electron transport chain
- F 685 :
-
Intensity of chlorophyll fluorescence at 685 nm
- F 740 :
-
Intensity of chlorophyll fluorescence at 740 nm
- HL:
-
High light
- LHCII:
-
Light-harvesting complex II
- LL:
-
Low light
- Lut:
-
Lutein
- NPQ:
-
Non-photochemical quenching
- OJIP:
-
Polyphasic fast chlorophyll fluorescence induction
- PAM:
-
Pulse amplitude modulation
- Pc:
-
Plastocyanin
- PSA:
-
Photosynthetic apparatus
- PSI:
-
Photosystem I
- PSII:
-
Photosystem II
- PQ:
-
Plastoquinone
- P700 :
-
Primary electron donor in photosystem I
- QA, QB :
-
Electron acceptors of PSII; primary and secondary plastoquinones
- qE:
-
Rapid (energy-dependent) component of NPQ
- qI:
-
NPQ component related to inactivation of PSII
- qM:
-
Medium component of NPQ
- qT:
-
NPQ component related to state transitions
- SIF:
-
Slow induction of fluorescence
- VDE:
-
Violaxanthin de-epoxidase
- V:
-
Violaxanthin
- WL:
-
White light
- Z:
-
Zeaxanthin
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Acknowledgements
This work was supported in part by the Russian Foundation for Basic Research (RFBR Project 15-04-03790a). Analysis of carotenoid composition was funded by Russian Science Foundation (RSCF Project 14-50-00029).
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Mishanin, V.I., Trubitsin, B.V., Patsaeva, S.V. et al. Acclimation of shade-tolerant and light-resistant Tradescantia species to growth light: chlorophyll a fluorescence, electron transport, and xanthophyll content. Photosynth Res 133, 87–102 (2017). https://doi.org/10.1007/s11120-017-0339-1
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DOI: https://doi.org/10.1007/s11120-017-0339-1