Abstract
Hypoxia deprives cells of energy and induces severe physical damage in embryophytes. Under hypoxia, the equilibrium between ethylene and H2O2 affects the response of the transcription factor AtERF73/HRE1. To evaluate the role of AtERF73/HRE1 during hypoxia signaling, we used three independent AtERF73/HRE1 knockout lines to detect H2O2 accumulation. The results revealed that under hypoxia, H2O2 accumulation in the AtERF73/HRE1 knockout lines decreased, indicating that AtERF73/HRE1 uses a negative feedback regulation mechanism to influence the production of H2O2 induced through hypoxia signal transduction. Quantitative RT-PCR analyses showed that oxygen deficiency had different effects on the expression of the hypoxia-induced genes Rboh B, D, G, and I in the AtERF73/HRE1 knockout lines. In particular, Rboh B and D expression were increased, whereas Rboh G expression was decreased. The expression of Rboh I was increased at 1 h but decreased at 3 h during hypoxia treatment in the AtERF73/HRE1 knockout lines. Similarly, the transcript levels of antioxidant and hypoxia-induced/ethylene response genes in the AtERF73/HRE1 knockout lines were affected by hypoxic stress, indicating that AtERF73/HRE1 is essential to hypoxia signal transduction in embryophytes. Additionally, in histochemical analysis, AtERF73/HRE1 promoter-induced GUS expression was detected in various plant parts throughout the plant growth process (e.g., leaves, inflorescences, siliques), particularly in the edges of mature leaves and guard cells. Taken together, our results confirm that AtERF73/HRE1 plays a role in H2O2 production by affecting the hypoxia-induced expression of Rboh genes in hypoxia signal transduction.
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Abbreviations
- APX:
-
Ascorbate peroxidase
- CAT:
-
Catalase
- ERF73/HRE1:
-
Ethylene-responsive factors73/ hypoxia responsive1
- GR:
-
Glutathione reductase
- GUS:
-
β-glucuronidase
- H2O2 :
-
Hydrogen peroxide
- RBOH:
-
Respiratory burst oxidase homolog
- ROS:
-
Reactive oxygen species
- RT-PCR:
-
Reverse transcriptase-polymerase chain reaction
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Acknowledgments
This work was supported by the National Science Council (NSC 101-2311-B-005-001 to Chin-Ying Yang).
Author contribution statement
C-Y Yang designed the experiments, conducted the experiments, prepared the figures, and wrote the manuscript. Y-C Huang carried out part of the qRT-PCR experiments. S-L Ou carried out the statistical analysis.
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Handling Editor: Néstor Carrillo
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Yang, CY., Huang, YC. & Ou, SL. ERF73/HRE1 is involved in H2O2 production via hypoxia-inducible Rboh gene expression in hypoxia signaling. Protoplasma 254, 1705–1714 (2017). https://doi.org/10.1007/s00709-016-1064-x
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DOI: https://doi.org/10.1007/s00709-016-1064-x