Abstract
Although excess excitation energy (EEE) can damage the photosynthetic apparatus and deregulate many cellular processes, some studies have reported that EEE can be used by plants to optimize the resistance to pathogen infection. Here, we investigated whether the EEE-induced resistance to pathogen infection might be mediated by mitochondrial alternative oxidase (AOX). The present work showed that exposure of Arabidopsis (Arabidopsis thaliana) leaves to short-term excess light or treatment of Arabidopsis leaves with the electron transport inhibitor, DBMIB (2,5-dibromo-3-methyl-6-isopropyl-p-benzoquinone), restricted the growth of virulent biotrophic bacteria, Pseudomonas syringae pv tomato (Pst) DC3000. Exposure to short-term excess light or DBMIB treatment also enhanced the level of the capacity of the cyanide-resistant respiration of the infected leaves. The lack of AOX1a gene in the AtAOX1a anti-sense line attenuated the excess light- or DBMIB-induced resistance toward Pst DC3000. These results indicate that AOX may play a role in regulating the EEE-induced resistance to virulent pathogen infection.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (no. 31560070, 31360044, and 31260059), Key Project of Chinese Ministry of Education (no. 211190), the University Scientific Research Project of Gansu Province (No. 2015A-007), the Fundamental Research Funds for the Gansu Universities of Gansu Provincial Department of Finance, and the Youth Teacher Scientific Research Ability Promotion Plan of Innovation Team Project of Northwest Normal University.
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Hou, Qz., Sun, K., Jia, Ly. et al. Alternative oxidase functions in the excess excitation energy-induced resistance to pathogen infection. Biologia 73, 207–215 (2018). https://doi.org/10.2478/s11756-018-0018-5
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DOI: https://doi.org/10.2478/s11756-018-0018-5