Differential requirement of Oryza sativa RAR1 in immune receptor-mediated resistance of rice to Magnaporthe oryzae |
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Authors: | Min-Young Song Chi-Yeol Kim Muho Han Hak-Seung Ryu Sang-Kyu Lee Li Sun Zuhua He Young-Su Seo Patrick Canal Pamela C Ronald Jong-Seong Jeon |
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Institution: | 12317. Graduate School of Biotechnology and Crop Biotech Institute, Kyung Hee University, Yongin, 446-701, Korea 22317. National Key Laboratory of Plant Molecular Genetics, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, 200032, China 32317. Department of Microbiology, Pusan National University, Busan, 609-735, Korea 42317. Department of Plant Pathology and the Genome Center, University of California, Davis, CA, 95616, USA
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Abstract: | The required for Mla12 resistance (RAR1) protein is essential for the plant immune response. In rice, a model monocot species, the function of Oryza sativa RAR1 (OsRAR1) has been little explored. In our current study, we characterized the response of a rice osrar1 T-DNA insertion mutant to infection by Magnaporthe oryzae, the causal agent of rice blast disease. osrar1 mutants displayed reduced resistance compared with wild type rice when inoculated with the normally virulent M. oryzae isolate PO6-6, indicating that OsRAR1 is required for an immune response to this pathogen. We also investigated the function of OsRAR1 in the resistance mechanism mediated by the immune receptor genes Pib and Pi5 that encode nucleotide binding-leucine rich repeat (NB-LRR) proteins. We inoculated progeny from Pib/osrar1 and Pi5/osrar1 heterozygous plants with the avirulent M. oryzae isolates, race 007 and PO6-6, respectively. We found that only Pib-mediated resistance was compromised by the osrar1 mutation and that the introduction of the OsRAR1 cDNA into Pib/osrar1 rescued Pib-mediated resistance. These results indicate that OsRAR1 is required for Pib-mediated resistance but not Pi5-mediated resistance to M. oryzae. |
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Keywords: | immune receptor NB-LRR OsRAR1 resistance rice |
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