Abstract
Melatonin has different functions in plant growth and development, especially in the protection of plants suffering from various forms of abiotic stress. We explored the effect of melatonin priming on photosynthetic activity of tomato (Lycopersicon esculentum L.) leaves. Our results showed that 100 µM is the optimal concentration used for alleviation of the damage to photosynthetic apparatus. Melatonin priming both in the form of leaf spray and direct root application was found to reduce the damage to photosynthetic apparatus, and increase the electron transfer rate and quantum yield of PSI and PSII photochemistry, to protect the thylakoid membrane from damage caused by low-temperature stress. Our study provides fundamental information for further research on the molecular mechanism of melatonin function in regulating photosynthesis.
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Abbreviations
- C a :
-
ambient CO2 concentration
- C i :
-
intercellular CO2 concentration
- Chl:
-
chlorophyll
- CK:
-
control
- CK0:
-
plants were grown at normal temperature (day and night temperature of 25/15°C) for 3 d after pretreatment by spraying water on leaves and applying 50 mL of water on roots
- CK1:
-
plants were grown at low temperature (day and night temperature of 15/6°C) for 3 d after pretreatment by spraying water on leaves and applying 50 mL of water on roots
- E :
-
transpiration rate
- ETRI :
-
electron transfer rate of PSI
- ETRII :
-
electron transfer rate of PSII
- Fv/Fm :
-
the maximum photochemical quantum yield of PSII
- Fv′/Fm′:
-
the efficiency of excitation energy capture by open PSII reaction center
- g s :
-
stomatal conductance
- L100:
-
plants were grown at low temperature (day and night temperature of 15/6°C) for 3 d after pretreatment by leaf spraying 100 µM melatonin on leaves and applying 50 mL of water on roots
- Ls :
-
stomatal limitation
- MDA:
-
malondialdehyde
- NPQ:
-
nonphotochemical quenching
- Pm :
-
PSI content
- P N :
-
net photosynthetic rate
- PSI-CEF:
-
cyclic electron flow around PSI
- qP :
-
photochemical quenching coefficient
- R100:
-
plants were grown at low temperature (day and night temperature of 15/6°C) for 3 d after pretreatment by spraying water on leaves and applying 100 mL of melatonin on roots
- RLC:
-
rapid light curve
- RNS:
-
reactive nitrogen species
- ROS:
-
reactive oxygen species
- WUE:
-
water-use efficiency (= PN/E)
- YI :
-
quantum yield of PSI photochemistry
- YII :
-
actual quantum yield of PSII photochemistry for light-adapted state
- YNA :
-
quantum yield of nonphotochemical energy dissipation due to acceptor side limitation
- YND :
-
quantum yield of nonphotochemical energy dissipation due to donor side limitation
- YNPQ :
-
quantum yield of regulatory energy dissipation
- YNO :
-
quantum yield of nonregulatory energy dissipation.
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Acknowledgements: This work was supported by the National Key Research Program of China (2016YFD0201004); National Natural Science Foundation of China (Grant No. 31301813) and China Agriculture Research System (Grant No. CARS-25).
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Yang, X.L., Xu, H., Li, D. et al. Effect of melatonin priming on photosynthetic capacity of tomato leaves under low-temperature stress. Photosynthetica 56, 884–892 (2018). https://doi.org/10.1007/s11099-017-0748-6
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DOI: https://doi.org/10.1007/s11099-017-0748-6