Abstract
Dust deposition on leaf surfaces can impact the growth and physiological traits of plants. We carried out a field experiment to investigate short-term effects of light surface dust on photosynthesis of cotton in the Tarim Basin using chlorophyll fluorescence and gas-exchange techniques. JIP-test analysis of OJIP curves showed that the total performance index for leaves without dust decreased by 32% at noon compared to the morning value. High irradiance at noon reduced actual quantum yield of PSII and increased nonphotochemical quenching for leaves without dust, showing photoinhibition. It suggested that light surface dust alleviated photoinhibition of cotton to high irradiance on a short-term basis. For the leaves without dust, high irradiance induced photoinhibition not only with respect to the photochemistry reactions but the biochemical pathways of CO2 fixation. Mechanisms such as thermal dissipation and enhanced electron flux to PSI protected the photosynthetic apparatus under high irradiance.
Abbreviations
- F0 :
-
minimum quantum yield of the dark-adapted state
- Fm :
-
maximal quantum yield of the dark-adapted state
- Fm’:
-
maximal quantum yield of the light-adapted state
- Ft :
-
steady-state fluorescence yield of the light-adapted state
- g s :
-
stomatal conductance
- PIt :
-
performance index for energy conservation from photons absorbed by PSII antenna to the reduction of PSI acceptors
- P N :
-
net photosynthetic rate
- RC:
-
reaction center
- RC/ABS:
-
reaction center density per absorption flux
- φDo :
-
dissipated energy flux
- φEo :
-
quantum yield of the electron transport flux from QA to QB
- φPo :
-
maximum quantum yield of primary PSII photochemistry
- Φf,D :
-
quantum yield of constitutive nonregulatory (basal or dark) dissipation processes consisting of fluorescence emission and heat dissipation
- ΦNPQ :
-
quantum yield of regulatory light-induced nonphotochemical quenching
- ΦP :
-
actual quantum yield of PSII photochemistry for the light-adapted state
- δRo :
-
efficiency with which an electron from QB is transferred until PSI acceptors
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Acknowledgements: The work was financially supported by National Natural Science Foundation of China (No. 41271494, No. 41671486). We thank editors for help in preparation of the manuscript and some reviewers for their valuable suggestions.
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Li, L., Mu, G. Short-term effects of surface dust: alleviating photoinhibition of cotton under high irradiance in the Tarim Basin. Photosynthetica 56, 976–980 (2018). https://doi.org/10.1007/s11099-017-0744-x
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DOI: https://doi.org/10.1007/s11099-017-0744-x