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He H, Yi K, Yang L, Jing Y, Kang L, Gao Z, Xiang D, Tan G, Wang Y, Liu Q, Xie L, Jiang S, Liu T, Chen W. Development of a lytic Ralstonia phage cocktail and evaluation of its control efficacy against tobacco bacterial wilt. FRONTIERS IN PLANT SCIENCE 2025; 16:1554992. [PMID: 40182540 PMCID: PMC11966396 DOI: 10.3389/fpls.2025.1554992] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/03/2025] [Accepted: 02/19/2025] [Indexed: 04/05/2025]
Abstract
Introduction Bacterial wilt (BW) caused by Ralstonia pseudosolanacearum is a devastating soil-borne disease. Bacteriophages are important biocontrol resources that rapidly and specifically lyse host bacteria, showing good application potential in agricultural production. Methods This study isolated nine phages (YL1-YL9) and, using host range and pot experiments, identified two broader host range phages (YL1 and YL4) and two higher control efficacy phages (YL2 and YL3), which were combined to obtain five cocktails (BPC-1-BPC-5). Results Pot experiments showed that BPC-1 (YL3 and YL4) had the highest control efficacy (99.25%). Biological characterization revealed that these four phages had substantial thermal stability and pH tolerance. Whole genome sequencing and analysis showed that YL1, YL2, YL3, and YL4 belonged to the genus Gervaisevirus. AlphaFold 3 predictions of tail fiber protein II structures showed that YL1 differed significantly from the other phages. Amino acid sequence alignment revealed that the ORF66 (YL1) "tip domain" of contained a higher proportion of aromatic and positively charged amino acids. However, the surface of the ORF69 (YL4) "tip domain" exhibited more positively charged residues than ORF66 (YL2) and ORF70 (YL3). These characteristics are hypothesized to confer a broader host range to YL1 and YL4. Discussion This study demonstrates that phages assembling a broad host range and high control efficacy have better biocontrol potential, providing high-quality resources for the biological control of BW.
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Affiliation(s)
- Haoxin He
- College of Plant Protection, Hunan Agricultural University, Changsha, China
| | - Ke Yi
- Tobacco Leaf Raw Material Procurement Center, China Tobacco Hunan Industrial Co., Ltd, Changsha, China
| | - Lei Yang
- Tobacco Leaf Raw Material Procurement Center, China Tobacco Hunan Industrial Co., Ltd, Changsha, China
| | - Yongfeng Jing
- Tobacco Leaf Raw Material Procurement Center, China Tobacco Hunan Industrial Co., Ltd, Changsha, China
| | - Lifu Kang
- Tobacco Leaf Raw Material Procurement Center, China Tobacco Hunan Industrial Co., Ltd, Changsha, China
| | - Zhihao Gao
- Tobacco Leaf Raw Material Procurement Center, China Tobacco Hunan Industrial Co., Ltd, Changsha, China
| | - Dong Xiang
- Tobacco Leaf Raw Material Procurement Center, China Tobacco Hunan Industrial Co., Ltd, Changsha, China
| | - Ge Tan
- Tobacco Leaf Raw Material Procurement Center, China Tobacco Hunan Industrial Co., Ltd, Changsha, China
| | - Yunsheng Wang
- College of Plant Protection, Hunan Agricultural University, Changsha, China
| | - Qian Liu
- College of Plant Protection, Hunan Agricultural University, Changsha, China
| | - Lin Xie
- College of Plant Protection, Hunan Agricultural University, Changsha, China
| | - Shiya Jiang
- College of Plant Protection, Hunan Agricultural University, Changsha, China
| | - Tianbo Liu
- Plant Protection Research Center, Hunan Tobacco Science Research Institute, Changsha, China
| | - Wu Chen
- College of Plant Protection, Hunan Agricultural University, Changsha, China
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Lin G, Gao J, Zou J, Li D, Cui Y, Liu Y, Kong L, Liu S. Whole-Genome Sequence and Characterization of Ralstonia solanacearum MLY102 Isolated from Infected Tobacco Stalks. Genes (Basel) 2024; 15:1473. [PMID: 39596673 PMCID: PMC11593729 DOI: 10.3390/genes15111473] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2024] [Revised: 11/06/2024] [Accepted: 11/07/2024] [Indexed: 11/29/2024] Open
Abstract
BACKGROUND/OBJECTIVES Bacterial wilt disease is a soil-borne disease caused by Ralstonia solanacearum that causes huge losses to crop economies worldwide. METHODS In this work, strain MLY102 was isolated and further identified as R. solanacearum from a diseased tobacco stalk. The genomic properties of MLY102 were explored by performing biochemical characterization, genome sequencing, compositional analysis, functional annotation and comparative genomic analysis. RESULTS MLY102 had a pinkish-red color in the center of the colony surrounded by a milky-white liquid with fluidity on TTC medium. The biochemical results revealed that MLY102 can utilize carbon sources, including D-glucose (dGLU), cane sugar (SAC) and D-trehalose dihydrate (dTRE). Genome sequencing through the DNBSEQ and PacBio platforms revealed a genome size of 5.72 Mb with a G+C content of 67.59%. The genome consists of a circular chromosome and a circular giant plasmid with 5283 protein-coding genes. A comparison of the genomes revealed that MLY102 is closely related to GMI1000 and CMR15 but has 498 special genes and 13 homologous genes in the species-specific gene family, indicating a high degree of genomic uniqueness. CONCLUSIONS The unique characteristics and genomic data of MLY102 can provide important reference values for the prevention and control of bacterial wilt disease.
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Affiliation(s)
- Guan Lin
- School of Biological & Chemical Engineering, Zhejiang University of Science & Technology, Hangzhou 310023, China; (G.L.); (J.G.); (J.Z.); (D.L.); (Y.C.); (S.L.)
| | - Juntao Gao
- School of Biological & Chemical Engineering, Zhejiang University of Science & Technology, Hangzhou 310023, China; (G.L.); (J.G.); (J.Z.); (D.L.); (Y.C.); (S.L.)
| | - Junxian Zou
- School of Biological & Chemical Engineering, Zhejiang University of Science & Technology, Hangzhou 310023, China; (G.L.); (J.G.); (J.Z.); (D.L.); (Y.C.); (S.L.)
| | - Denghui Li
- School of Biological & Chemical Engineering, Zhejiang University of Science & Technology, Hangzhou 310023, China; (G.L.); (J.G.); (J.Z.); (D.L.); (Y.C.); (S.L.)
| | - Yu Cui
- School of Biological & Chemical Engineering, Zhejiang University of Science & Technology, Hangzhou 310023, China; (G.L.); (J.G.); (J.Z.); (D.L.); (Y.C.); (S.L.)
| | - Yong Liu
- School of Biological & Chemical Engineering, Zhejiang University of Science & Technology, Hangzhou 310023, China; (G.L.); (J.G.); (J.Z.); (D.L.); (Y.C.); (S.L.)
| | - Lingxue Kong
- Institute for Frontier Materials, Deakin University, Geelong, VIC 3216, Australia
| | - Shiwang Liu
- School of Biological & Chemical Engineering, Zhejiang University of Science & Technology, Hangzhou 310023, China; (G.L.); (J.G.); (J.Z.); (D.L.); (Y.C.); (S.L.)
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Wang R, Li B, Cai S, Ding Y, Shi M, Jin T, Lin W, Liu P. Genetic Diversity of Ralstonia solanacearum Causing Tobacco Bacterial Wilt in Fujian Province and Identification of Biocontrol Streptomyces sp. PLANT DISEASE 2024; 108:1946-1958. [PMID: 38499975 DOI: 10.1094/pdis-08-23-1604-sr] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/20/2024]
Abstract
Tobacco bacterial wilt is a highly destructive soilborne disease caused by the Ralstonia solanacearum species complex, exhibiting a significant risk to global flue-cured tobacco cultivation and resulting in substantial economic loss. In this study, 77 isolates were collected from three prominent flue-cured tobacco cultivation areas in Fujian, China (Nanping, Sanming, and Longyan), in 2021 and 2022. The isolated strains were classified through phylotype-specific multiplex polymerase chain reaction (Pmx-PCR) and physiological tests. The analysis showed that all the strains were associated with phylotype I, race 1, and biovar III. Subsequent phylogenetic analysis using partial egl gene sequences classified the 77 isolates into 5 distinct sequevars: 13, 15, 16, 17, and 34. Notably, a remarkable predominance of sequevar 15 was observed in Fujian Province, while sequevar 16 was first reported on tobacco in China, which was identified in other plants, expanding the understanding of its host range and distribution in the country. In addition, a Streptomyces strain extracted from the rhizosphere soil of tobacco was found to inhibit the growth of multiple sequevars of tobacco R. solanacearum, indicating its broad-spectrum antagonistic properties. Furthermore, pot experiments showed that the strain St35 effectively controlled tobacco bacterial wilt. The isolate St35 was conclusively identified as Streptomyces gancidicus according to the morphological and genetic features. In summary, the present study demonstrated the genetic diversity and distribution of tobacco R. solanacearum strains in the Fujian province of China, as well as the identification of a candidate biological control agent for the management of tobacco bacterial wilt.
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Affiliation(s)
- Rongbo Wang
- Fujian Key Laboratory for Monitoring and Integrated Management of Crop Pests, Institute of Plant Protection, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China
| | - Benjin Li
- Fujian Key Laboratory for Monitoring and Integrated Management of Crop Pests, Institute of Plant Protection, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China
| | - Songling Cai
- Fujian Key Laboratory for Monitoring and Integrated Management of Crop Pests, Institute of Plant Protection, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China
| | - Yingfu Ding
- Nanping Branch, Fujian Tobacco Company, Nanping 353000, China
| | - Mingyue Shi
- Fujian Key Laboratory for Monitoring and Integrated Management of Crop Pests, Institute of Plant Protection, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China
| | - Ting Jin
- Xiamen Chanke Bioengineering Co., Ltd., Xiamen 361000, China
| | - Wei Lin
- Nanping Branch, Fujian Tobacco Company, Nanping 353000, China
| | - Peiqing Liu
- Fujian Key Laboratory for Monitoring and Integrated Management of Crop Pests, Institute of Plant Protection, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China
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Wang D, Yin Y, Zhang X, Ye J. An Interspecies Recombinant Sida Yellow Mosaic China Virus Isolate and Betasatellite Cause a Leaf Curl Disease in Tobacco in Hainan, China. PLANT DISEASE 2024; 108:877-886. [PMID: 37743589 DOI: 10.1094/pdis-07-23-1346-re] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/26/2023]
Abstract
Tobacco (Nicotiana tabacum) is an herbaceous crop. Cigar tobacco, a group of tobacco cultivars, has recently been planted in a few provinces in China. Since its introduction, symptoms such as leaf curling and vein thickening have appeared. Here we report a begomovirus, Sida yellow mosaic China virus-Hainan isolate (designated SiYMCNV-HN), associated with the betasatellite (designated SiYMCNB-HN) as the causal agent of a leaf curl disease in cigar tobacco (N. tabacum cv. Haiyan101) in Hainan Province, China. Phylogenetic and recombination analyses indicate that SiYMCNV-HN is an interspecies recombinant with a SiYMCNV isolate as the major parent and a Sida yellow vein Vietnam virus isolate as the minor parent. Full-length infectious clones of SiYMCNV-HN and SiYMCNB-HN were generated, which were highly infectious and induced high pathogenicity through agroinfiltration in Nicotiana benthamiana and N. tabacum. This newly reported recombinant begomovirus poses potential threats to tobacco plantations in the region.
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Affiliation(s)
- Duan Wang
- State Key Laboratory of Plant Genomics, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
- CAS Center for Excellence in Biotic Interactions, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yuteng Yin
- State Key Laboratory of Plant Genomics, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
- CAS Center for Excellence in Biotic Interactions, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xuan Zhang
- State Key Laboratory of Plant Genomics, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
| | - Jian Ye
- State Key Laboratory of Plant Genomics, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
- CAS Center for Excellence in Biotic Interactions, University of Chinese Academy of Sciences, Beijing 100049, China
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