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Soybean Cytochrome b5 Is a Restriction Factor for Soybean Mosaic Virus

National Center for Soybean Improvement, Nanjing Agricultural University, Nanjing 210095, China
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Viruses 2019, 11(6), 546; https://doi.org/10.3390/v11060546
Received: 23 April 2019 / Revised: 6 June 2019 / Accepted: 7 June 2019 / Published: 11 June 2019
(This article belongs to the Section Viruses of Plants, Fungi and Protozoa)
Soybean mosaic virus (SMV) is one of the most destructive viral diseases in soybeans (Glycine max). In this study, an interaction between the SMV P3 protein and cytochrome b5 was detected by yeast two-hybrid assay, and bimolecular fluorescence complementation assay showed that the interaction took place at the cell periphery. Further, the interaction was confirmed by co-immunoprecipitation analysis. Quantitative real-time polymerase chain reaction analysis revealed that GmCYB5 gene was differentially expressed in resistant and susceptible soybean plants after inoculation with SMV-SC15 strain. To test the involvement of this gene in SMV resistance, the GmCYB5 was silenced using a bean pod mottle virus (BPMV)-based vector construct. Results showed that GmCYB5-1 was 83% and 99% downregulated in susceptible (NN1138-2) and resistant (RN-9) cultivars, respectively, compared to the empty vector-treated plants. Silencing of GmCYB5 gene promotes SMV replication in soybean plants. Our results suggest that during SMV infection, the host CYB5 protein targets P3 protein to inhibit its proliferation. Taken together, these results suggest that CYB5 is an important factor in SMV infection and replication in soybeans, which could help soybean breeders develop SMV resistant soybean cultivars. View Full-Text
Keywords: P3 protein; cytochrome b5; yeast two-hybrid; virus-induced gene silencing P3 protein; cytochrome b5; yeast two-hybrid; virus-induced gene silencing
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Luan, H.; Niu, H.; Luo, J.; Zhi, H. Soybean Cytochrome b5 Is a Restriction Factor for Soybean Mosaic Virus. Viruses 2019, 11, 546.

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