Abstract
Key Message
The blast resistance allele of OsBsr-d1 does not exist in most japonica rice varieties of Jilin Province in China. The development of Bsr-d1 knockout mutants via CRISPR/Cas9 enhances broad-spectrum resistance to rice blast in Northeast China.
Abstract
Rice blast is a global disease that has a significant negative impact on rice yield and quality. Due to the complexity and variability of the physiological races of rice blast, controlling rice blast is challenging in agricultural production. Bsr-d1, a negative transcription factor that confers broad-spectrum resistance to rice blast, was identified in the indica rice cultivar Digu; however, its biological function in japonica rice varieties is still unclear. In this study, we analyzed the blast resistance allele of Bsr-d1 in a total of 256 japonica rice varieties from Jilin Province in Northeast China and found that this allele was not present in these varieties. Therefore, we generated Bsr-d1 knockout mutants via the CRISPR/Cas9 system using the japonica rice variety Jigeng88 (JG88) as a recipient variety. Compared with those of the wild-type JG88, the homozygous Bsr-d1 mutant lines KO#1 and KO#2 showed enhanced leaf blast resistance at the seedling stage to several Magnaporthe oryzae (M. oryzae) races collected from Jilin Province in Northeast China. Physiological and biochemical indices revealed that the homozygous mutant lines produced more hydrogen peroxide than did JG88 plants when infected with M. oryzae. Comparative RNA-seq revealed that the DEGs were mainly involved in the synthesis of amide compounds, zinc finger proteins, transmembrane transporters, etc. In summary, our results indicate that the development of Bsr-d1 knockout mutants through CRISPR/Cas9 can enhance the broad-spectrum resistance of rice in Northeast China to rice blast. This study not only provides a theoretical basis for disease resistance breeding involving the Bsr-d1 gene in Northeast China, but also provides new germplasm resources for disease-resistance rice breeding.
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Acknowledgements
This research was supported by grants from the Jilin Provincial Natural Science Fundation in China (20210101026JC) and the Jilin Provincial Agricultural Science and Technology Innovation Project in China (CXGC2023RCY050).
Funding
Natural Science Fundation of Jilin Province, 20210101026JC, Yong-Mei Jin, Jilin Provincial Agricultural Science and Technology Independent Innovation Fund, CXGC2023RCY050, Anqi Song.
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Y-MJ and YZ designed the experiments. YZ, X-FL, LL, R-HP, SW, AS and MG performed the experiments. YZ, LL, R-HP and Y-MJ analyzed the data. Y-MJ, YZ and R-HP participated in the writing of the manuscript. All the authors contributed to the article and approved the submitted version.
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Zhang, Y., Lin, XF., Li, L. et al. CRISPR/Cas9-mediated knockout of Bsr-d1 enhances the blast resistance of rice in Northeast China. Plant Cell Rep 43, 100 (2024). https://doi.org/10.1007/s00299-024-03192-0
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DOI: https://doi.org/10.1007/s00299-024-03192-0