Abstract
The effects of high temperature on CO2 assimilation rate, processes associated with photosynthetic electron and proton transport, as well as photoprotective responses, were studied in chlorophyll b-deficient mutant lines (ANK-32A and ANK-32B) and wild type (WT) of wheat (Triticum aestivum L.). Despite the low chlorophyll content and chlorophyll a-to-b ratio, the non-stressed mutant plants had the similar level of CO2 assimilation and photosynthetic responses as WT. However, in ANK mutant plants exposed to prolonged high temperature episode (42 °C for ~10 h), we observed lower CO2 assimilation compared to WT, especially when a high CO2 supply was provided. In all heat-exposed plants, we found approximately the same level of PSII photoinhibition, but the decrease in content of photooxidizable PSI was higher in ANK mutant plants compared to WT. The PSI damage can be well explained by the level of overreduction of PSI acceptor side observed in plants exposed to high temperature, which was, in turn, the result of the insufficient transthylakoid proton gradient associated with low non-photochemical quenching and lack of ability to downregulate the linear electron transport to keep the reduction state of PSI acceptor side low enough. Compared to WT, the ANK mutant lines had lower capacity to drive the cyclic electron transport around PSI in moderate and high light; it confirms the protective role of cyclic electron transport for the protection of PSI against photoinhibition. Our results, however, also suggest that the inactivation of PSI in heat stress conditions can be the protective mechanism against photooxidative damage of chloroplast and cell structures.
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Abbreviations
- ACO2 :
-
CO2 assimilation rate
- Chl:
-
Chlorophyll
- ChlF:
-
Chlorophyll a fluorescence
- Cyt b 6/f :
-
Cytochrome b 6/f
- LED:
-
Light-emitting diode
- LHC:
-
Light harvesting complex
- P700:
-
Primary electron donor of PSI (reduced form)
- P700+ :
-
Primary electron donor of PSI (oxidized form)
- PAR:
-
Photosynthetic active radiation
- pmf :
-
Proton motive force
- PQ:
-
Plastoquinone
- PS I:
-
Photosystem I
- PS II:
-
Photosystem II
- QA :
-
Primary PSII acceptor
- RCs:
-
Reaction centers
- ROS:
-
Reactive oxygen species
- qE:
-
pH-dependent energy dissipation
- WT:
-
Wild type; the genotype with normal chlorophyll synthesis
- ΔpH:
-
Transthylakoid pH gradient
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This work was supported by the research project of the Scientific Grant Agency of Slovak Republic VEGA- 1-0923-16. SIA was supported by grants from the Russian Foundation for Basic Research, and by Molecular and Cell Biology Programs of the Russian Academy of Sciences.
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Brestic, M., Zivcak, M., Kunderlikova, K. et al. High temperature specifically affects the photoprotective responses of chlorophyll b-deficient wheat mutant lines. Photosynth Res 130, 251–266 (2016). https://doi.org/10.1007/s11120-016-0249-7
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DOI: https://doi.org/10.1007/s11120-016-0249-7