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Meng XJ, Wang LQ, Ma BG, Wei XH, Zhou Y, Sun ZX, Li YY. Screening, identification and evaluation of an acidophilic strain of Bacillus velezensis B4-7 for the biocontrol of tobacco bacterial wilt. FRONTIERS IN PLANT SCIENCE 2024; 15:1360173. [PMID: 38751839 PMCID: PMC11094357 DOI: 10.3389/fpls.2024.1360173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Accepted: 04/15/2024] [Indexed: 05/18/2024]
Abstract
Tobacco (Nicotiana tabacum L.) bacterial wilt, caused by Ralstonia solanacearum, is indeed a highly destructive plant disease, leading to substantial damage in tobacco production. While biological control is considered an effective measure for managing bacterial wilt, related research in this area has been relatively limited compared to other control methods. In order to discover new potential antagonistic bacteria with high biocontrol efficacy against tobacco bacterial wilt, we conducted an analysis of the microbial composition differences between disease-suppressive and disease-conducive soils using Illumina sequencing. As a result, we successfully isolated six strains from the disease-suppressive soil that exhibited antibacterial activity against Ralstonia solanacearum. Among these strains, B4-7 showed the strongest antibacterial activity, even at acidic conditions with a pH of 4.0. Based on genome analysis using Average Nucleotide Identity (ANI), B4-7 was identified as Bacillus velezensis. In greenhouse and field trials, strain B4-7 significantly reduced the disease index of tobacco bacterial wilt, with control efficiencies reaching 74.03% and 46.88% respectively. Additionally, B4-7 exhibited plant-promoting abilities that led to a 35.27% increase in tobacco production in field conditions. Quantitative real-time (qPCR) analysis demonstrated that strain B4-7 effectively reduced the abundance of R. solanacearum in the rhizosphere. Genome sequencing and Liquid Chromatography-Mass Spectrometry (LC-MS) analysis revealed that strain B4-7 potentially produces various lipopeptide metabolites, such as microlactin, bacillaene, difficidin, bacilysin, and surfactin. Furthermore, B4-7 influenced the structure of the rhizosphere soil microbial community, increasing bacterial abundance and fungal diversity, while also promoting the growth of different beneficial microorganisms. In addition, B4-7 enhanced tobacco's resistance to R. solanacearum by increasing the activities of defense enzymes, including superoxide dismutase (SOD), phenylalanine ammonia-lyase (PAL), peroxidase (POD), catalase (CAT), and polyphenol oxidase (PPO). Collectively, these findings suggest that B. velezensis B4-7 holds significant biocontrol potential and can be considered a promising candidate strain for eco-friendly management of tobacco bacterial wilt.
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Affiliation(s)
- Xiang-jia Meng
- College of Agriculture, Yangtze University, Jingzhou, Hubei, China
| | - Lan-qin Wang
- College of Agriculture, Yangtze University, Jingzhou, Hubei, China
| | - Bai-ge Ma
- College of Agriculture, Yangtze University, Jingzhou, Hubei, China
| | - Xi-hong Wei
- College of Agriculture, Yangtze University, Jingzhou, Hubei, China
| | - Yi Zhou
- College of Agriculture, Yangtze University, Jingzhou, Hubei, China
- Early Detection and Management of Agricultural and Forestry Pests, Jingzhou, Hubei, China
| | - Zheng-xiang Sun
- College of Agriculture, Yangtze University, Jingzhou, Hubei, China
- Early Detection and Management of Agricultural and Forestry Pests, Jingzhou, Hubei, China
| | - Yan-yan Li
- Tobacco Research Institute of Hubei Province, Wuhan, Hubei, China
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Tiwari I, Bhojiya AA, Prasad R, Porwal S, Varma A, Choudhary DK. Putative Role of Anti-microbial Peptide Recovered from Lactiplantibacillus spp. in Biocontrol Activity. Curr Microbiol 2024; 81:88. [PMID: 38311656 DOI: 10.1007/s00284-023-03586-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Accepted: 12/12/2023] [Indexed: 02/06/2024]
Abstract
Antimicrobial peptides (AMPs) stand as a promising alternative to conventional pesticides, leveraging a multifaceted approach to combat plant pathogens. This study focuses on identifying and characterizing the AMP produced by Lactiplantibacillus argentoratensis strain IT, demonstrating potent antibacterial activity against various harmful microorganisms. Evaluation of AMPs' antibacterial activity was conducted through an agar well diffusion assay, a reliable method for assessing secondary metabolite antimicrobial efficacy. The study unveils the antimicrobial potential of the purified extract obtained from Lactiplantibacillus argentoratensis IT, isolated from goat milk. Notably, the AMP exhibited robust antibacterial activity against phytopathogens affecting solanaceous crops, including the Gram-negative Ralstonia solanacearum. Expression conditions and purification methods were optimized to identify the peptide's mass and sequence, utilizing LC-MS and SDS-PAGE. This paper underscores the application potential of Lactiplantibacillus spp. IT as a biocontrol agent for managing bacterial infectious diseases in plants. Results indicate optimal AMP production at 37 °C, with a culture broth pH of 5 during fermentation. The obtained peptide sequence corresponded to peaks at 842.5 and 2866.4 m/z ratio, with a molecular weight of approximately 5 kDa according to tricine SDS-PAGE analysis. In conclusion, this study lays the foundation for utilizing Lactiplantibacillus spp. IT derived AMPs in plant biocontrol strategies, showcasing their efficacy against bacterial phytopathogens. These findings contribute valuable insights for advancing sustainable agricultural practices.
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Affiliation(s)
- Ishan Tiwari
- Amity Institute of Microbial Technology, Amity University Uttar Pradesh, Noida, 201313, India
| | - Ali Asger Bhojiya
- Department of Botany, U.S. Ostwal P.G. College, Mangalwad, Chittorgarh, Rajasthan, 312024, India
| | - Ram Prasad
- Mahatma Gandhi Central University, Motihari, Bihar, 845401, India
| | - Shalini Porwal
- Amity Institute of Microbial Technology, Amity University Uttar Pradesh, Noida, 201313, India.
| | - Ajit Varma
- Amity Institute of Microbial Technology, Amity University Uttar Pradesh, Noida, 201313, India
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Vinothini K, Nakkeeran S, Saranya N, Jothi P, Prabu G, Pavitra K, Afzal M. Metagenomic profiling of tomato rhizosphere delineates the diverse nature of uncultured microbes as influenced by Bacillus velezensis VB7 and Trichoderma koningiopsis TK towards the suppression of root-knot nematode under field conditions. 3 Biotech 2024; 14:2. [PMID: 38058363 PMCID: PMC10695903 DOI: 10.1007/s13205-023-03851-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2023] [Accepted: 11/08/2023] [Indexed: 12/08/2023] Open
Abstract
The plant-parasitic Root Knot Nematodes (Meloidogyne spp.,) play a pivotal role to devastate vegetable crops across the globe. Considering the significance of plant-microbe interaction in the suppression of Root Knot Nematode, we investigated the diversity of microbiome associated with bioagents-treated and nematode-infected rhizosphere soil samples through metagenomics approach. The wide variety of organisms spread across different ecosystems showed the highest average abundance within each taxonomic level. In the rhizosphere, Proteobacteria, Firmicutes, and Actinobacteria were the dominant bacterial taxa, while Ascomycota, Basidiomycota, and Mucoromycota were prevalent among the fungal taxa. Regardless of the specific treatments, bacterial genera like Bacillus, Sphingomonas, and Pseudomonas were consistently found in high abundance. Shannon diversity index vividly ensured that, bacterial communities were maximum in B. velezensis VB7-treated soil (1.4-2.4), followed by Root Knot Nematode-associated soils (1.3-2.2), whereas richness was higher with Trichoderma konigiopsis TK drenched soils (1.3-2.0). The predominant occurrence of fungal genera such as Aspergillus Epicoccum, Choanephora, Alternaria and Thanatephorus habituate rhizosphere soils. Shannon index expressed the abundant richness of fungal species in treated samples (1.04-0.90). Further, refraction and species diversity curve also depicted a significant increase with maximum diversity of fungal species in B. velezensis VB7-treated soil than T. koningiopsis and nematode-infested soil. In field trial, bioagents-treated tomato plant (60% reduction of Meloidogyne incognita infection) had reduced gall index along with enhanced plant growth and increased fruit yield in comparison with the untreated plant. Hence, B. velezensis VB7 and T. koingiopsis can be well explored as an antinemic bioagents against RKN. Supplementary Information The online version contains supplementary material available at 10.1007/s13205-023-03851-1.
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Affiliation(s)
- K. Vinothini
- Department of Plant Pathology, Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu 641 003 India
| | - S. Nakkeeran
- Department of Plant Pathology, Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu 641 003 India
| | - N. Saranya
- Department of Plant Molecular Biology and Bioinformatics, Centre for Plant Molecular Biology and Biotechnology, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu 641 003 India
| | - P. Jothi
- Department of Nematology, Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu 641 003 India
| | - G. Prabu
- Director, Syngenome (OPC) Private Limited, Coimbatore, Tamil Nadu 641 003 India
| | - K. Pavitra
- Department of Plant Molecular Biology and Bioinformatics, Centre for Plant Molecular Biology and Biotechnology, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu 641 003 India
| | - Mohd Afzal
- Department of Chemistry, College of Science, King Saud University, 11451 Riyadh, Saudi Arabia
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Zhang J, Wei Y, Li H, Hu J, Zhao Z, Wu Y, Yang H, Li J, Zhou Y. Rhizosphere Microbiome and Phenolic Acid Exudation of the Healthy and Diseased American Ginseng Were Modulated by the Cropping History. PLANTS (BASEL, SWITZERLAND) 2023; 12:2993. [PMID: 37631203 PMCID: PMC10459672 DOI: 10.3390/plants12162993] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2023] [Revised: 08/15/2023] [Accepted: 08/17/2023] [Indexed: 08/27/2023]
Abstract
The infection of soil-borne diseases has the potential to modify root exudation and the rhizosphere microbiome. However, the extent to which these modifications occur in various monocropping histories remains inadequately explored. This study sampled healthy and diseased American ginseng (Panax quinquefolius L.) plants under 1-4 years of monocropping and analyzed the phenolic acids composition by HPLC, microbiome structure by high-throughput sequencing technique, and the abundance of pathogens by quantitative PCR. First, the fungal pathogens of Fusarium solani and Ilyonectria destructans in the rhizosphere soil were more abundant in the diseased plants than the healthy plants. The healthy American ginseng plants exudated more phenolic acid, especially p-coumaric acid, compared to the diseased plants after 1-2 years of monocropping, while this difference gradually diminished with the increase in monocropping years. The pathogen abundance was influenced by the exudation of phenolic acids, e.g., total phenolic acids (r = -0.455), p-coumaric acid (r = -0.465), and salicylic acid (r = -0.417), and the further in vitro test confirmed that increased concentration of p-coumaric acid inhibited the mycelial growth of the isolated pathogens for root rot. The healthy plants had a higher diversity of rhizosphere bacterial and fungal microbiome than the diseased plants only after a long period of monocropping. Our study has revealed that the cropping history of American ginseng has altered the effect of pathogens infection on rhizosphere microbiota and root exudation.
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Affiliation(s)
- Jiahui Zhang
- Ecology Institute of Qilu University of Technology (Shandong Academy of Sciences), Jinan 250013, China; (J.Z.); (Y.W.); (H.L.); (J.H.); (Z.Z.); (Y.W.); (H.Y.)
| | - Yanli Wei
- Ecology Institute of Qilu University of Technology (Shandong Academy of Sciences), Jinan 250013, China; (J.Z.); (Y.W.); (H.L.); (J.H.); (Z.Z.); (Y.W.); (H.Y.)
| | - Hongmei Li
- Ecology Institute of Qilu University of Technology (Shandong Academy of Sciences), Jinan 250013, China; (J.Z.); (Y.W.); (H.L.); (J.H.); (Z.Z.); (Y.W.); (H.Y.)
| | - Jindong Hu
- Ecology Institute of Qilu University of Technology (Shandong Academy of Sciences), Jinan 250013, China; (J.Z.); (Y.W.); (H.L.); (J.H.); (Z.Z.); (Y.W.); (H.Y.)
| | - Zhongjuan Zhao
- Ecology Institute of Qilu University of Technology (Shandong Academy of Sciences), Jinan 250013, China; (J.Z.); (Y.W.); (H.L.); (J.H.); (Z.Z.); (Y.W.); (H.Y.)
| | - Yuanzheng Wu
- Ecology Institute of Qilu University of Technology (Shandong Academy of Sciences), Jinan 250013, China; (J.Z.); (Y.W.); (H.L.); (J.H.); (Z.Z.); (Y.W.); (H.Y.)
| | - Han Yang
- Ecology Institute of Qilu University of Technology (Shandong Academy of Sciences), Jinan 250013, China; (J.Z.); (Y.W.); (H.L.); (J.H.); (Z.Z.); (Y.W.); (H.Y.)
| | - Jishun Li
- Ecology Institute of Qilu University of Technology (Shandong Academy of Sciences), Jinan 250013, China; (J.Z.); (Y.W.); (H.L.); (J.H.); (Z.Z.); (Y.W.); (H.Y.)
| | - Yi Zhou
- School of Agriculture, Food and Wine, The University of Adelaide, Glen Osmond, SA 5064, Australia
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Kashyap S, Sharma I, Dowarah B, Barman R, Gill SS, Agarwala N. Plant and soil-associated microbiome dynamics determine the fate of bacterial wilt pathogen Ralstonia solanacearum. PLANTA 2023; 258:57. [PMID: 37524889 DOI: 10.1007/s00425-023-04209-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Accepted: 07/18/2023] [Indexed: 08/02/2023]
Abstract
MAIN CONCLUSION Plant and the soil-associated microbiome is important for imparting bacterial wilt disease tolerance in plants. Plants are versatile organisms that are endowed with the capacity to withstand various biotic and abiotic stresses despite having no locomotory abilities. Being the agent for bacterial wilt (BW) disease, Ralstonia solanacearum (RS) colonizes the xylem vessels and limits the water supply to various plant parts, thereby causing wilting. The havoc caused by RS leads to heavy losses in crop productivity around the world, for which a sustainable mitigation strategy is urgently needed. As several factors can influence plant-microbe interactions, comprehensive understanding of plant and soil-associated microbiome under the influence of RS and various environmental/edaphic conditions is important to control this pathogen. This review mainly focuses on microbiome dynamics associated with BW disease and also provide update on microbial/non-microbial approaches employed to control BW disease in crop plants.
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Affiliation(s)
- Sampurna Kashyap
- Department of Botany, Gauhati University, Gopinath Bordoloi Nagar, Jalukbari, Guwahati, Assam, 781014, India
| | - Indrani Sharma
- Department of Botany, Gauhati University, Gopinath Bordoloi Nagar, Jalukbari, Guwahati, Assam, 781014, India
| | - Bhaskar Dowarah
- Department of Botany, Bahona College, Bahona, Jorhat, Assam, 785101, India
| | - Ramen Barman
- Department of Botany, Gauhati University, Gopinath Bordoloi Nagar, Jalukbari, Guwahati, Assam, 781014, India
| | - Sarvajeet Singh Gill
- Centre for Biotechnology, Maharshi Dayanand University, Rohtak, Haryana, 124001, India.
| | - Niraj Agarwala
- Department of Botany, Gauhati University, Gopinath Bordoloi Nagar, Jalukbari, Guwahati, Assam, 781014, India.
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Guo W, Zhang J, Li MH, Qi L. Soil fungal community characteristics vary with bamboo varieties and soil compartments. Front Microbiol 2023; 14:1120679. [PMID: 36814565 PMCID: PMC9939831 DOI: 10.3389/fmicb.2023.1120679] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2022] [Accepted: 01/16/2023] [Indexed: 02/09/2023] Open
Abstract
Soil fungi play an important role in nutrient cycling, mycorrhizal symbiosis, antagonism against pathogens, and organic matter decomposition. However, our knowledge about the community characteristics of soil fungi in relation to bamboo varieties is still limited. Here, we compared the fungal communities in different soil compartments (rhizosphere vs. bulk soil) of moso bamboo (Phyllostachys edulis) and its four varieties using ITS high-throughput sequencing technology. The fungal α diversity (Shannon index) in bulk soil was significantly higher than that in rhizosphere soil, but it was not affected by bamboo variety or interactions between the soil compartment and bamboo variety. Soil compartment and bamboo variety together explained 31.74% of the variation in fungal community diversity. Soil compartment and bamboo variety were the key factors affecting the relative abundance of the major fungal taxa at the phylum and genus levels. Soil compartment mainly affected the relative abundance of the dominant fungal phylum, while bamboo variety primarily influenced the dominant fungal genus. Network analysis showed that the fungal network in rhizosphere soil was more complex, stable, and connected than that in bulk soil. A FUNGuild database analysis indicated that both soil compartment and bamboo variety affect fungal functions. Our findings provide new insights into the roles of both soil compartments and plant species (including variety) in shaping soil fungal communities.
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Affiliation(s)
- Wen Guo
- Key Laboratory of National Forestry and Grassland Administration/Beijing Bamboo and Rattan Science and Technology, International Centre for Bamboo and Rattan, Beijing, China,Forest Dynamics, Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Birmensdorf, Switzerland
| | - Jian Zhang
- Key Laboratory of National Forestry and Grassland Administration/Beijing Bamboo and Rattan Science and Technology, International Centre for Bamboo and Rattan, Beijing, China
| | - Mai-He Li
- Forest Dynamics, Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Birmensdorf, Switzerland,Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains, Ministry of Education, School of Geographical Sciences, Northeast Normal University, Changchun, China,School of Life Science, Hebei University, Baoding, China,*Correspondence: Mai-He Li,
| | - Lianghua Qi
- Key Laboratory of National Forestry and Grassland Administration/Beijing Bamboo and Rattan Science and Technology, International Centre for Bamboo and Rattan, Beijing, China,Sanya Research Base, International Centre for Bamboo and Rattan, Sanya, China,Lianghua Qi,
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Ma YN, Gu YL, Liu J, Zhang Y, Wang X, Xia Z, Wei HL. Deciphering the rhizosphere bacteriome associated with biological control of tobacco black shank disease. FRONTIERS IN PLANT SCIENCE 2023; 14:1152639. [PMID: 37077642 PMCID: PMC10108594 DOI: 10.3389/fpls.2023.1152639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/28/2023] [Accepted: 03/22/2023] [Indexed: 05/03/2023]
Abstract
Introduction The black shank disease seriously affects the health of tobacco plants. Conventional control methods have limitations in terms of effectiveness or economic aspects and cause public health concerns. Thus, biological control methods have come into the field, and microorganisms play a key role in suppressing tobacco black shank disease. Methods In this study, we examined the impact of soil microbial community on black shank disease basing on the structural difference of bacterial communities in rhizosphere soils. We used Illumina sequencing to compare the bacterial community diversity and structure in different rhizosphere soil samples in terms of healthy tobacco, tobacco showing typical black shank symptoms, and tobacco treated with the biocontrol agent, Bacillus velezensis S719. Results We found that Alphaproteobacteria in the biocontrol group, accounted for 27.2% of the ASVs, was the most abundant bacterial class among three groups. Heatmap and LEfSe analyses were done to determine the distinct bacterial genera in the three sample groups. For the healthy group, Pseudomonas was the most significant genus; for the diseased group, Stenotrophomonas exhibited the strongest enrichment trend, and Sphingomonas showed the highest linear discriminant analysis score, and was even more abundant than Bacillus; for the biocontrol group, Bacillus, and Gemmatimonas were the largely distributed genus. In addition, co-occurrence network analysis confirmed the abundance of taxa, and detected a recovery trend in the network topological parameters of the biocontrol group. Further functional prediction also provided a possible explanation for the bacterial community changes with related KEGG annotation terms. Discussion These findings will improve our knowledge of plant-microbe interactions and the application of biocontrol agents to improve plant fitness, and may contribute to the selection of biocontrol strains.
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Affiliation(s)
- Yi-Nan Ma
- Key Laboratory of Microbial Resources Collection and Preservation, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Yi-Lin Gu
- Key Laboratory of Microbial Resources Collection and Preservation, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Jing Liu
- Zunyi Tobacco Company of Guizhou Provincial Tobacco Corporation, Zunyi, China
| | - Yuqin Zhang
- China National Tobacco Corporation Shandong Branch, Jinan, China
| | - Xinwei Wang
- Key Laboratory of Tobacco Pest Monitoring & Integrated Management in Tobacco, Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao, China
| | - Zhenyuan Xia
- Yunnan Academy of Tobacco Agricultural Science, Kunming, China
- *Correspondence: Zhenyuan Xia, ; Hai-Lei Wei,
| | - Hai-Lei Wei
- Key Laboratory of Microbial Resources Collection and Preservation, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China
- *Correspondence: Zhenyuan Xia, ; Hai-Lei Wei,
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Liu X, Liu L, Gong J, Zhang L, Jiang Q, Huang K, Ding W. Soil conditions on bacterial wilt disease affect bacterial and fungal assemblage in the rhizosphere. AMB Express 2022; 12:110. [PMID: 36036292 PMCID: PMC9424452 DOI: 10.1186/s13568-022-01455-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Accepted: 08/22/2022] [Indexed: 11/10/2022] Open
Abstract
Natural soil has the ability to suppress the soil-borne pathogen to a certain extent, and the assemblage of soil microbiome plays a crucial role in maintaining such ability. Long-term monoculture accelerates the forms of soil microbiome and leads to either disease conducive or suppressive soils. Here, we explored the impact of soil conditions on bacterial wilt disease (healthy or diseased) under long-term tobacco monoculture on the assemblage of bacterial and fungal communities in bulk and rhizosphere soils during the growth periods. With Illumina sequencing, we compared the bacterial and fungal composition of soil samples from tobacco bacterial wilt diseased fields and healthy fields in three growth periods. We found that Proteobacteria and Ascomycota were the most abundant phylum for bacteria and fungi, respectively. Factors of soil conditions and tobacco growth periods can significantly influence the microbial composition in bulk soil samples, while the factor of soil conditions mainly determined the microbial composition in rhizosphere soil samples. Next, rhizosphere samples were further analyzed with LEfSe to determine the discriminative taxa affected by the factor of soil conditions. For bacteria, the genus Ralstonia was found in the diseased soils, whereas the genus Flavobacterium was the only shared taxon in healthy soils; for fungi, the genus Chaetomium was the most significant taxon in healthy soils. Besides, network analysis confirmed that the topologies of networks of healthy soils were higher than that of diseased soils. Together, our results suggest that microbial assemblage in the rhizosphere will be largely affected by soil conditions especially after long-term monoculture.
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Affiliation(s)
- Xiaojiao Liu
- State Key Laboratory of Silkworm Genome Biology, Key Laboratory of Sericultural Biology and Genetic Breeding in Ministry of Agriculture, College of Sericulture, Textile and Biomass Science, Southwest University, Chongqing, 400715, China.,Microecological Process and Regulation Key Laboratory, College of Plant Protection, Southwest University, Chongqing, 400715, China
| | - Liehua Liu
- Microecological Process and Regulation Key Laboratory, College of Plant Protection, Southwest University, Chongqing, 400715, China
| | - Jie Gong
- Microecological Process and Regulation Key Laboratory, College of Plant Protection, Southwest University, Chongqing, 400715, China
| | - Lixin Zhang
- Microecological Process and Regulation Key Laboratory, College of Plant Protection, Southwest University, Chongqing, 400715, China
| | - Qipeng Jiang
- Microecological Process and Regulation Key Laboratory, College of Plant Protection, Southwest University, Chongqing, 400715, China
| | - Kuo Huang
- Microecological Process and Regulation Key Laboratory, College of Plant Protection, Southwest University, Chongqing, 400715, China.,Zhengzhou Tobacco Research Institute of China National Tobacco Corporation, Henan, 450001, China
| | - Wei Ding
- Microecological Process and Regulation Key Laboratory, College of Plant Protection, Southwest University, Chongqing, 400715, China.
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The Effects of Plant Health Status on the Community Structure and Metabolic Pathways of Rhizosphere Microbial Communities Associated with Solanum lycopersicum. HORTICULTURAE 2022. [DOI: 10.3390/horticulturae8050404] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Powdery mildew disease caused by Oidium neolycopersici is one of the major diseases affecting tomato production in South Africa. Interestingly, limited studies exist on how this disease affects the community structure microbial communities associated with tomato plants employing shotgun metagenomics. In this study, we assess how the health status of a tomato plant affects the diversity of the rhizosphere microbial community. We collected soil samples from the rhizosphere of healthy (HR) and diseased (DR; powdery mildew infected) tomatoes, alongside bulk soil (BR), extracted DNA, and did sequencing using shotgun metagenomics. Our results demonstrated that the rhizosphere microbiome alongside some specific functions were abundant in HR followed by DR and bulk soil (BR) in the order HR > DR > BR. We found eighteen (18) bacterial phyla abundant in HR, including Actinobacteria, Acidobacteria, Aquificae, Bacteroidetes, etc. The dominant fungal phyla include; Ascomycota and Basidiomycota, while the prominent archaeal phyla are Thaumarchaeota, Crenarchaeota, and Euryarchaeota. Three (3) bacteria phyla dominated the DR samples; Bacteroidetes, Gemmatimonadetes, and Thermotoga. Our result also employed the SEED subsystem and revealed that the metabolic pathways involved were abundant in HR. The α-diversity demonstrates that there is no significant difference among the rhizosphere microbiomes across the sites, while β-diversity demonstrated a significant difference.
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Secreted Secondary Metabolites Reduce Bacterial Wilt Severity of Tomato in Bacterial-Fungal Co-Infections. Microorganisms 2021; 9:microorganisms9102123. [PMID: 34683444 PMCID: PMC8537627 DOI: 10.3390/microorganisms9102123] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Revised: 09/30/2021] [Accepted: 10/01/2021] [Indexed: 12/11/2022] Open
Abstract
In order to gain a comprehensive understanding of plant disease in natural and agricultural ecosystems, it is essential to examine plant disease in multi-pathogen-host systems. Ralstonia solanacearum and Fusarium oxysporum f. sp. lycopersici are vascular wilt pathogens that can result in heavy yield losses in susceptible hosts such as tomato. Although both pathogens occupy the xylem, the costs of mixed infections on wilt disease are unknown. Here, we characterize the consequences of co-infection with R. solanacearum and F. oxysporum using tomato as the model host. Our results demonstrate that bacterial wilt severity is reduced in co-infections, that bikaverin synthesis by Fusarium contributes to bacterial wilt reduction, and that the arrival time of each microbe at the infection court is important in driving the severity of wilt disease. Further, analysis of the co-infection root secretome identified previously uncharacterized secreted metabolites that reduce R. solanacearum growth in vitro and provide protection to tomato seedlings against bacterial wilt disease. Taken together, these results highlight the need to understand the consequences of mixed infections in plant disease.
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