Abstract
The objective of this investigation was to evaluate the simultaneous action of light stress and salinity. Pulse amplitude modulated chlorophyll fluorescence, P700 redox state, and pigment analysis were used to assess the impact of high light intensity on Paulownia tomentosa × fortunei and Paulownia elongata × elongata grown on soils with different salinity. It was found that light stress reduced the amount of pigments and the efficiency of photochemical energy conversion, inhibited the maximum and the effective quantum yields of PSII photochemistry, decreased photochemical quenching and photosynthetic rate. Data also showed influence on the primary quinone acceptor (QA) reoxidation, which led to the restriction of the electron flow from QA to plastoquinone and stimulation of the cyclic electron flow. The possible reasons for the increased effects of the light stress under conditions of high salt concentration in soil for Paulownia tomentosa × fortunei are discussed.
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Abbreviations
- A1 :
-
amplitude of the fast exponent of dark reduction kinetics of reaction center of PSI
- A2 :
-
amplitude of the slow exponent of dark reduction kinetics of reaction center of PSI
- Car(s):
-
carotenoid(s)
- Chl:
-
chlorophyll
- DAS:
-
dark-adapted state
- EE0 :
-
Paulownia elongata × elongata grown in nonsaline soil
- EE1 :
-
Paulownia elongata × elongata grown in soil type 1
- EE2 :
-
Paulownia elongata × elongata grown in soil type 2
- ETR:
-
linear electron transport rate
- F0 :
-
minimal fluorescence level
- Fm :
-
maximal fluorescence level
- Fv/Fm :
-
maximum quantum yield of PSII photochemistry
- Fv/F0 :
-
ratio of photochemical to nonphotochemical processes
- F ′v /F ′v :
-
effective quantum yield of PSII photochemistry
- ФPSII :
-
the effective quantum yield of photochemical energy conversion of PSII
- k1 :
-
fast rate constant of maximal chlorophyll fluorescence relaxation
- k2 :
-
slow rate constant of maximal chlorophyll fluorescence relaxation
- k P7001 :
-
fast rate constant of dark reduction kinetics of reaction center of PSI
- k P7002 :
-
slow rate constant of dark reduction kinetics of reaction center of PSI
- LAS:
-
light-adapted state
- LIC:
-
light-induced change
- P700 :
-
reaction center of PSI
- qP:
-
photochemical quenching coefficient
- RFd :
-
chlorophyll fluorescence decrease ratio
- TF0 :
-
Paulownia tomentosa × fortunei grown in nonsaline soil
- TF1:
-
Paulownia tomentosa × fortunei grown in soil type 1
- TF2:
-
Paulownia tomentosa × fortunei grown in soil type 2
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Acknowledgements: This work was supported by the Bulgarian Academy of Sciences and the Program for career development of young scientists, BAS (Contract ДФНП-138/12.05.2016). The authors are grateful to Bio Tree for providing the plants.
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Stefanov, M., Yotsova, E., Markovska, Y. et al. Effect of high light intensity on the photosynthetic apparatus of two hybrid lines of Paulownia grown on soils with different salinity. Photosynthetica 56, 832–840 (2018). https://doi.org/10.1007/s11099-017-0735-y
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DOI: https://doi.org/10.1007/s11099-017-0735-y