Abstract
The purpose of this study was to explore the effect of reducing nitric oxide (NO) in Rumex K-1 leaves on the photoprotection of photosystem II (PSII) under high temperature with strong light. Reducing the content of NO in Rumex K-1 leaves significantly aggravated the PSII photoinhibition and net degradation of D1 protein under high temperature with strong light, but not under high temperature in the darkness. The reduction of NO remarkably inhibited the electron transport of PSII in the leaves under high temperature and strong light, which resulted in an increase in excitation pressure and an over-accumulation of reactive oxygen species (ROS). The over-accumulation of ROS further damaged PSII. However, when the synthesis of D1 protein was inhibited, the D1 protein content and PSII activity were no longer influenced by reducing NO content in the leaves. The reduction of NO in leaves decreased the activities of ROS scavenger enzymes after treatment with high temperature and strong light for 2 h, which enhanced the over-accumulation of ROS to damage photosynthetic apparatus severely. All of these results suggest that NO was involved in the synthesis of D1 protein. Maintaining physiologically appropriate NO content in leaves will alleviate net degradation of D1 protein under high temperature with strong light to keep photosynthetic electrons flowing smoothly, which mitigates the accumulation of ROS in photosystems to avoid damage to the photosynthetic apparatus. Therefore, NO plays an important role in maintaining higher PSII photosynthetic performance under high temperature with strong light.
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Acknowledgments
This work was financially supported by the National Natural Science Foundation of China (31370276) and the State Key Basic Research and Development Plan of China (2015CB150105) and the Higher School Specialized Research Foundation for the Doctoral Program (20113702110008).
Author’s Contributions
**ngkai Che, Zishan Zhang, Liqiao **, Meijun Liu, Yuting Li and Huiyuan Gao designed research; **ngkai Che performed research; **ngkai Che and Liqiao ** analyzed data; **ngkai Che, Shijie Zhao and Huiyuan Gao wrote the paper.
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Che, X., Zhang, Z., **, L. et al. Effect of Reducing Nitric Oxide in Rumex K-1 Leaves on the Photoprotection of Photosystem II Under High Temperature with Strong Light. J Plant Growth Regul 35, 1118–1125 (2016). https://doi.org/10.1007/s00344-016-9615-0
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DOI: https://doi.org/10.1007/s00344-016-9615-0