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OsWRKY24, a blast-disease responsive transcription factor, positively regulates rice disease resistance

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Abstract

WRKYs are plant-specific transcription factors that play important roles in disease response. Here, we showed that a WRKY gene in rice, OsWRKY24, was upregulated in response to inoculation with rice blast fungus Pyricularia oryzae. Its expression was also induced by wounding. Green fluorescent protein-fused OsWRKY24 localized to nuclei in rice epidermal cells, and OsWRKY24 had transactivation activity in yeast cells. In addition, functional repression of OsWRKY24 through a chimeric repressor (OsWRKY24-SRDX) greatly increased susceptibility to P. oryzae. These results indicate that OsWRKY24 is a transcriptional activator that positively regulates disease resistance in rice.

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Acknowledgements

We thank former Prof. H. Naitoh (Akita Prefectural University, Japan) for providing P. oryzae isolate P91-15B. We also thank Dr. N. Ishii-Minami, Ms. E. Nakajima, Ms. M. Kouzai, and Mr. K. Nakajima for daily technical assistance and Dr. T. Tsuchida-Mayama, Dr. K. Abe, Ms. K. Iida-Okada, and Mr. A. Horikawa of NIAS, and Mr. T. Ishizuka and Ms. Y. Takiguchi of AIST and Mr. K. Sato of GreenSogna Inc. for generating SRDX rice lines. Japanese isolate Ina86-137 of P. oryzae (MAFF 101511) was supplied by NARO Genebank in Tsukuba, Japan. This research was supported by a grant to YN from the Japan Society for the Promotion of Science initiated by the Council for Science and Technology Policy (GS028) and also in part by grants from the Ministry of Agriculture, Forestry and Fisheries (Genomics for Agricultural Innovation, AMR0001 to HI and AMR0004 to MO-T and NM).

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Correspondence to Yoko Nishizawa.

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Yokotani, N., Shikata, M., Ichikawa, H. et al. OsWRKY24, a blast-disease responsive transcription factor, positively regulates rice disease resistance. J Gen Plant Pathol 84, 85–91 (2018). https://doi.org/10.1007/s10327-018-0768-5

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