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RNAi-mediated resistance to rice black-streaked dwarf virus in transgenic rice

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Abstract

Rice black-streaked dwarf virus (RBSDV), a member of the genus Fijivirus in the family Reoviridae, causes significant economic losses in rice production in China and many other Asian countries. Development of resistant varieties by using conventional breeding methods is limited, as germplasm with high level of resistance to RBSDV have not yet been found. One of the most promising methods to confer resistance against RBSDV is the use of RNA interference (RNAi) technology. RBSDV non-structural protein P7-2, encoded by S7-2 gene, is a potential F-box protein and involved in the plant-virus interaction through the ubiquitination pathway. P8, encoded by S8 gene, is the minor core protein that possesses potent active transcriptional repression activity. In this study, we transformed rice calli using a mini-twin T-DNA vector harboring RNAi constructs of the RBSDV genes S7-2 or S8, and obtained plants harboring the target gene constructs and the selectable marker gene, hygromycin phosphotransferase (HPT). From the offspring of these transgenic plants, we obtained selectable marker (HPT gene)-free plants. Homozygous T5 transgenic lines which harbored either S7-2-RNAi or S8-RNAi exhibited high level resistance against RBSDV under field infection pressure from indigenous viruliferous small brown planthoppers. Thus, our results showed that RNA interference with the expression of S7-2 or S8 genes seemed an effective way to induce high level resistance in rice against RBSD disease.

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Acknowledgements

This work was supported by grants from the National Key Research and Development Program (2016YFD0102001-006), the National Natural Science Foundation of China (31670313), Six Big Talent Peak of Jiangsu Province (NY018), Key Project of Jiangsu Education Department of China (15KJA180010), and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

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Correspondence to Hengxiu Yu.

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Mohamed M. S. Ahmed, Shiquan Bian, Muyue Wang, Jing Zhao and Bingwei Zhang have contributed equally to this work.

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Ahmed, M.M.S., Bian, S., Wang, M. et al. RNAi-mediated resistance to rice black-streaked dwarf virus in transgenic rice. Transgenic Res 26, 197–207 (2017). https://doi.org/10.1007/s11248-016-9999-4

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