Abstract
Our study investigated the physiological and biochemical basis for the effects of exogenous phenolic acids on the function of the photosynthetic apparatus and photosynthetic electron transport rate in strawberry seedlings. Potted seedlings of the strawberry (Fragaria × ananassa Duch.) were used. Syringic acid inhibited net photosynthetic rate and water-use efficiency decreased. Additionally, primary quinone electron acceptor of the PSII reaction centre, the PSII reaction centre and the oxygen evolving complex were also impaired. Both the maximum quantum yield of the PSII primary photochemistry and the performance index on absorption basis were depressed, resulting in reduced function of the photosynthetic electron transport chain. Otherwise, low phthalic acid concentrations enhanced photosynthetic capacity, while high concentrations showed opposite effects. Syringic acid exhibited a higher toxic effect than that of phthalic acid which was more evident at higher concentrations.
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Abbreviations
- ABS:
-
reaction center area
- Chl:
-
chlorophyll
- C i :
-
intercellular CO2 concentration
- E :
-
transpiration rate
- ETR:
-
electron transport rate
- Fj :
-
fluorescence yield at 2 ms
- Fk :
-
fluorescence yield at 300 μs
- Fm :
-
maximal fluorescence yield of the light-adapted state
- FM:
-
fresh mass
- Fo :
-
minimal fluorescence yield of the dark-adapted state
- Fv/Fm :
-
maximum quantum yield of PSII primary photochemistry
- gs:
-
stomatal conductance
- MR/MR0 :
-
modulated reflection of PSI at 820 nm
- OEC:
-
oxygen evolving complex
- PA:
-
phthalic acid
- PIABS:
-
performance index on absorption basis
- P N :
-
net photosynthetic rate
- P700:
-
the chlorophyll a maximum absorption peak of molecules at 700 nm
- RC:
-
the energy absorbed by active reaction center
- SA:
-
syringic acid
- Vk :
-
relative variable fluorescence at 300 μs
- Vj :
-
relative variable fluorescence at the J-step
- VPSI:
-
MR/MR0 maximal slope descending
- VPSI+PSII :
-
MR/MR0 maximal slope increasing
- Wk:
-
relative variable fluorescence at the K-step
- WUE:
-
water-use efficiency (= PN/E)
- Ψo :
-
the ratio of trapped exciton electrons to other electron acceptors downstream of QA.
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Acknowledgements: This work was supported by the Science and Technology Bureau China Spark Program of Liaoning Province (201410), and Physiology-Ecology of Northern Fruit Tree of Shenyang Agricultural University, China.
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Lu, X.F., Zhang, H., Lyu, S.S. et al. Effects of exogenous phenolic acids on photosystem functions and photosynthetic electron transport rate in strawberry leaves. Photosynthetica 56, 616–622 (2018). https://doi.org/10.1007/s11099-017-0702-7
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DOI: https://doi.org/10.1007/s11099-017-0702-7