Abstract
The plant hormone jasmonic acid (JA) regulates various developmental processes and plant defence responses to environmental stresses. We previously reported that RERJ1, a JA-inducible transcription factor in rice, is up-regulated by exposure to wounding and drought stress. Here, we demonstrated that the expression of RERJ1 after wounding is regulated in a JA-dependent manner in rice, based on histochemical analysis of RERJ1 promoter-GUS transgenic plants. RERJ1 expression was induced only at the region of injury after wounding, whereas expression was induced in the entire leaf after drought. According to JA measurements of stressed leaves, high accumulation of endogenous JA was only detected around the wound site in a rice leaves, whereas the drought treatment led to uniform accumulation of JA in the entire leaf, suggesting that RERJ1will be a useful marker gene for studies on localization of JA in rice. Nuclear localization and transactivation ability of RERJ1 were also demonstrated. These results suggest that RERJ1 plays a role as a transcriptional activator for regulating stress-inducible gene expression, with a strong correlation to JA accumulation in the stressed region.
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Abbreviations
- JA:
-
Jasmonic acid
- bHLH:
-
Basic helix–loop–helix
- DMSO:
-
Dimethyl sulphoxide
- qRT-PCR:
-
Quantitative reverse-transcription-polymerase chain reaction
- GFP:
-
Green fluorescent protein
- LC-ESI-MS/MS:
-
Liquid chromatography-electrospray ionization/tandem mass spectrometry
- CaMV:
-
Cauliflower mosaic virus
- LUC:
-
Luciferase
- ABA:
-
Abscisic acid
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Acknowledgments
We thank Professor Peter Nick (Karlsruhe Institute of Technology) for providing seeds of the hebiba mutant; Professor Tsuyoshi Nakagawa (Shimane University) for providing pGWB3, pGWB4, and pGWB5; and Dr M. Takagi and Dr M. Shikata (National Institute of Advanced Industrial Science and Technology) for providing 35S-GAL4DB, GAL4-TATA-LUC-NOS and pPTRL plasmids. This work was supported in part by Grants-in-Aid for Scientific Research (Researcher Number: 20312241) from the Japan Society for the Promotion of Science, and the Program for Promotion of Basic Research Activities for Innovative Biosciences (PROBRAIN).
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The authors declare that they have no conflict of interest.
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Miyamoto, K., Shimizu, T., Mochizuki, S. et al. Stress-induced expression of the transcription factor RERJ1 is tightly regulated in response to jasmonic acid accumulation in rice. Protoplasma 250, 241–249 (2013). https://doi.org/10.1007/s00709-012-0400-z
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DOI: https://doi.org/10.1007/s00709-012-0400-z