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Jiang L, Chen J, Yang YZ, Li R, Li S, Wang ZQ, Jiang T. Functional analysis of a viral promoter from a strawberry vein banding virus isolate from China. Virol J 2022; 19:60. [PMID: 35361243 PMCID: PMC8974135 DOI: 10.1186/s12985-022-01778-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Accepted: 03/08/2022] [Indexed: 11/10/2022] Open
Abstract
Background Promoters are important factors affecting gene expression in cells. The driven activities of viral promoters were generally assessed to screen available promoters for transgenic and research and biotech industries. In this study, we cloned a full-length promoter from a Chinese isolate of strawberry vein banding virus (SVBV) and produced several deletion mutants for evaluation of applications in production of reporter proteins in stable transgenic plants. Methods The full-length promoter of SVBV (SP1) and its three deletion mutants (SP2, SP3, and SP4) were amplified using polymerase chain reaction. The effects of SVBV SP1, SP2, SP3, and SP4 on gene expression were evaluated using β-glucuronidase (GUS) and green fluorescent protein (GFP) reporter genes. Results Transient expression assays showed that the SVBV SP1 promoter and its three deletion mutants all expressed the reporter genes, albeit at very different levels. Interestingly, transcriptional activity driven by the SP1 promoter was much higher than that of the cauliflower mosaic virus (CaMV) 35S promoter. After stable transformation of the GUS gene into Nicotiana tabacum plants, SVBV SP1-driven transgene expression was approximately 2.6-fold higher than CaMV 35S promoter-driven transgene expression. In addition, GUS gene expression levels were enhanced by co-inoculation of the plants with the SP1 promoter-driven vector carrying the GUS gene and the vector expressing SVBV open reading frame (ORF) V or ORF VI. Conclusions The SVBV SP1 promoter from the Chinese isolate evaluated in this study could successfully drive transient and stable expression in plants, it was a stronger promoter than the CaMV 35S and FLt-US promoters and may be more useful for the production of stable transgenic plants. Supplementary Information The online version contains supplementary material available at 10.1186/s12985-022-01778-2.
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Affiliation(s)
- Lei Jiang
- School of Plant Protection, Anhui Agricultural University, Hefei, 230036, People's Republic of China.,Anhui Province Key Laboratory of Integrated Pest Management on Crops, Hefei, 230036, People's Republic of China.,Key Laboratory of Biology and Sustainable Management of Plant Diseases and Pests of Anhui Higher Education Institutes, Anhui Agricultural University, Hefei, 230036, People's Republic of China
| | - Jing Chen
- School of Plant Protection, Anhui Agricultural University, Hefei, 230036, People's Republic of China.,Anhui Province Key Laboratory of Integrated Pest Management on Crops, Hefei, 230036, People's Republic of China.,Key Laboratory of Biology and Sustainable Management of Plant Diseases and Pests of Anhui Higher Education Institutes, Anhui Agricultural University, Hefei, 230036, People's Republic of China
| | - You-Zhi Yang
- School of Plant Protection, Anhui Agricultural University, Hefei, 230036, People's Republic of China.,Anhui Province Key Laboratory of Integrated Pest Management on Crops, Hefei, 230036, People's Republic of China.,Key Laboratory of Biology and Sustainable Management of Plant Diseases and Pests of Anhui Higher Education Institutes, Anhui Agricultural University, Hefei, 230036, People's Republic of China
| | - Rui Li
- School of Plant Protection, Anhui Agricultural University, Hefei, 230036, People's Republic of China.,Anhui Province Key Laboratory of Integrated Pest Management on Crops, Hefei, 230036, People's Republic of China.,Key Laboratory of Biology and Sustainable Management of Plant Diseases and Pests of Anhui Higher Education Institutes, Anhui Agricultural University, Hefei, 230036, People's Republic of China
| | - Shuang Li
- School of Plant Protection, Anhui Agricultural University, Hefei, 230036, People's Republic of China.,Anhui Province Key Laboratory of Integrated Pest Management on Crops, Hefei, 230036, People's Republic of China.,Key Laboratory of Biology and Sustainable Management of Plant Diseases and Pests of Anhui Higher Education Institutes, Anhui Agricultural University, Hefei, 230036, People's Republic of China
| | - Zhan-Qi Wang
- Key Laboratory of Vector Biology and Pathogen Control of Zhejiang Province, College of Life Sciences, Huzhou University, Huzhou, 313000, People's Republic of China.
| | - Tong Jiang
- School of Plant Protection, Anhui Agricultural University, Hefei, 230036, People's Republic of China. .,Anhui Province Key Laboratory of Integrated Pest Management on Crops, Hefei, 230036, People's Republic of China. .,Key Laboratory of Biology and Sustainable Management of Plant Diseases and Pests of Anhui Higher Education Institutes, Anhui Agricultural University, Hefei, 230036, People's Republic of China.
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Feng M, Zuo D, Jiang X, Li S, Chen J, Jiang L, Zhou X, Jiang T. Identification of Strawberry vein banding virus encoded P6 as an RNA silencing suppressor. Virology 2018; 520:103-110. [PMID: 29843054 DOI: 10.1016/j.virol.2018.05.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Revised: 05/04/2018] [Accepted: 05/07/2018] [Indexed: 11/25/2022]
Abstract
RNA silencing is a common mechanism that plays a key role in antiviral defense. To overcome host defense responses, plant viruses encode silencing-suppressor proteins to target one or several key steps in the silencing machinery. Here, we report that the P6 protein encoded by Strawberry vein banding virus (SVBV) is an RNA silencing suppressor through Agrobacterium-mediated co-infiltration assays. SVBV P6 protein can suppress green fluorescent protein (GFP) gene silencing induced by single-stranded RNA but not by double-stranded RNA. The P6 protein can also inhibit systemic silencing of GFP through interfering the systemic spread of GFP silencing signal. Subcellular localization study indicated that P6 protein formed irregular bodies and distributed in both cytoplasm and nucleus of Nicotiana benthamiana cells. Furthermore, deletion analysis indicated that a nuclear localization signal (NLS, aa 402-426) in the P6 protein is responsible for the silencing suppression efficiency. In addition, expression of the P6 protein via a Potato virus X (PVX)-based vectors induced more severe mosaic symptoms in N. benthamiana leaves, and transgenic N. benthamiana plants expressing P6 showed obvious vein yellowing as well as severe mosaic symptoms in leaves. Taken together, our results demonstrates that SVBV P6 is a suppressor of RNA silencing, possibly acting at a upstream step for dsRNA generation.
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Affiliation(s)
- Mingfeng Feng
- School of Plant Protection, Anhui Agricultural University, Hefei 230036, People's Republic of China
| | - Dengpan Zuo
- School of Plant Protection, Anhui Agricultural University, Hefei 230036, People's Republic of China
| | - Xizi Jiang
- School of Plant Protection, Anhui Agricultural University, Hefei 230036, People's Republic of China
| | - Shuai Li
- School of Plant Protection, Anhui Agricultural University, Hefei 230036, People's Republic of China
| | - Jing Chen
- School of Plant Protection, Anhui Agricultural University, Hefei 230036, People's Republic of China
| | - Lei Jiang
- School of Plant Protection, Anhui Agricultural University, Hefei 230036, People's Republic of China
| | - Xueping Zhou
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, People's Republic of China
| | - Tong Jiang
- School of Plant Protection, Anhui Agricultural University, Hefei 230036, People's Republic of China.
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Feng M, Zhang H, Pan Y, Hu Y, Chen J, Zuo D, Jiang T. Complete nucleotide sequence of strawberry vein banding virus Chinese isolate and infectivity of its full-length DNA clone. Virol J 2016; 13:164. [PMID: 27716385 PMCID: PMC5052798 DOI: 10.1186/s12985-016-0624-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2016] [Accepted: 09/27/2016] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Strawberry vein banding virus (SVBV) is a double-stranded DNA plant virus, which has been found in North America, Australia, Brazil, Japan, Europe and several provinces of China. Infected strawberry plants exhibit mild vein-banding symptoms and chlorosis along the veins. It is one of the most economically important diseases in Asiatic, European and North American strawberry-growing areas. FINDINGS The complete genome of an SVBV Chinese isolate (SVBV-CN) was isolated and cloned from a naturally infected strawberry (Fragaria × ananassa cv. Sachinoka) sample found in Shenyang city of Liaoning province. Sequence analysis revealed a complete genome of 7864 nucleotides (nts) that indicated SVBV-CN was most closely related to SVBV from the United States (SVBV-US) with a sequence similarity of 85.8 %. Two major clades were identified based on phylogenetic analysis of the complete genome sequences of caulimoviruses. SVBV-CN clustered together with SVBV-US, whereas other caulimoviruses formed a separate branch. Agrobacterium-mediated inoculation of Fragaria vesca with an infectious clone of SVBV-CN results in systemic infection with distinct symptoms of yellowing bands along the main leaf veins. This suggests that the SVBV-CN infectious clone can recapitulate the symptoms observed in naturally infected strawberries, and therefore is likely the causal agent of the original disease observed in strawberries. Furthermore, strawberry plants inoculated with the infectious clone using vacuum infiltration developed symptoms with a very high infection rate of 86-100 % in 4-5 weeks post-inoculation. This compares to an infection rate of 20-40 % in 8-9 weeks post-inoculation using syringe-inoculation. CONCLUSIONS The complete nucleotide sequence of SVBV from a naturally infected strawberry was determined. Agroinfiltration of strawberry plants using an infectious clone of SVBV-CN resulted in symptoms typically found in infected strawberries from Shenyang city of Liaoning province in China. This is the first report describing an infectious clone of SVBV-CN, and that vacuum infiltration can be potentially used as a new and highly efficient means for inoculation of strawberry plants.
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Affiliation(s)
- Mingfeng Feng
- School of Plant Protection, Anhui Agricultural University, Hefei, 230036 People’s Republic of China
| | - Hanping Zhang
- School of Plant Protection, Anhui Agricultural University, Hefei, 230036 People’s Republic of China
| | - Yuan Pan
- School of Plant Protection, Anhui Agricultural University, Hefei, 230036 People’s Republic of China
| | - Yahui Hu
- School of Plant Protection, Anhui Agricultural University, Hefei, 230036 People’s Republic of China
| | - Jing Chen
- School of Plant Protection, Anhui Agricultural University, Hefei, 230036 People’s Republic of China
| | - Dengpan Zuo
- School of Plant Protection, Anhui Agricultural University, Hefei, 230036 People’s Republic of China
| | - Tong Jiang
- School of Plant Protection, Anhui Agricultural University, Hefei, 230036 People’s Republic of China
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Chen J, Zhang H, Feng M, Zuo D, Hu Y, Jiang T. Transcriptome analysis of woodland strawberry (Fragaria vesca) response to the infection by Strawberry vein banding virus (SVBV). Virol J 2016; 13:128. [PMID: 27411713 PMCID: PMC4942977 DOI: 10.1186/s12985-016-0584-5] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2016] [Accepted: 07/04/2016] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND Woodland strawberry (Fragaria vesca) infected with Strawberry vein banding virus (SVBV) exhibits chlorotic symptoms along the leaf veins. However, little is known about the molecular mechanism of strawberry disease caused by SVBV. METHODS We performed the next-generation sequencing (RNA-Seq) study to identify gene expression changes induced by SVBV in woodland strawberry using mock-inoculated plants as a control. RESULTS Using RNA-Seq, we have identified 36,850 unigenes, of which 517 were differentially expressed in the virus-infected plants (DEGs). The unigenes were annotated and classified with Gene Ontology (GO), Clusters of Orthologous Group (COG) and Kyoto Encyclopedia of Genes and Genomes (KEGG) analyses. The KEGG pathway analysis of these genes suggested that strawberry disease caused by SVBV may affect multiple processes including pigment metabolism, photosynthesis and plant-pathogen interactions. CONCLUSIONS Our research provides comprehensive transcriptome information regarding SVBV infection in strawberry.
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Affiliation(s)
- Jing Chen
- School of Plant Protection, Anhui Agricultural University, Hefei, 230036 People’s Republic of China
| | - Hanping Zhang
- School of Plant Protection, Anhui Agricultural University, Hefei, 230036 People’s Republic of China
| | - Mingfeng Feng
- School of Plant Protection, Anhui Agricultural University, Hefei, 230036 People’s Republic of China
| | - Dengpan Zuo
- School of Plant Protection, Anhui Agricultural University, Hefei, 230036 People’s Republic of China
| | - Yahui Hu
- School of Plant Protection, Anhui Agricultural University, Hefei, 230036 People’s Republic of China
| | - Tong Jiang
- School of Plant Protection, Anhui Agricultural University, Hefei, 230036 People’s Republic of China
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