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Zhang J, Sun D, Shen H, Pu X, Liu P, Lin B, Yang Q. Dickeya fangzhongdai was prevalent and caused taro soft rot when coexisting with the Pectobacterium complex, with a preference for Araceae plants. Front Microbiol 2024; 15:1431047. [PMID: 38983626 PMCID: PMC11231085 DOI: 10.3389/fmicb.2024.1431047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2024] [Accepted: 06/11/2024] [Indexed: 07/11/2024] Open
Abstract
Bacterial soft rot caused by coinfection with Dickeya spp. and Pectobacterium spp. in hosts can cause successive changes in fields, and it is difficult to prevent the spread of and control the infection. Pectobacterium spp. are prevalent in the growing areas of tuberous crops, including taro and potato. Recently, Dickeya fangzhongdai has emerged as a virulent pathogen in taro. To determine the prevalence status of the causal agents and evaluate the potential spreading risks of D. fangzhongdai, screening and taxonomic classification were performed on phytopathogenic bacteria collected from different taro-growing areas in Guangdong Province, China, and biological and genomic characteristics were further compared among typical strains from all defined species. The causative agents were verified to be phytobacterial strains of D. fangzhongdai, Pectobacterium aroidearum and Pectobacterium colocasium. P. aroidearum and P. colocasium were found to form a complex preferring Araceae plants and show intensive genomic differentiation, indicating their ancestor had adapted to taro a long time prior. Compared with Pectobacterium spp., D. fangzhongdai was more virulent to taro corms under conditions of exogenous infection and more adaptable at elevated temperatures. D. fangzhongdai strains isolated from taro possessed genomic components of additional T4SSs, which were accompanied by additional copies of the hcp-vgrG genes of the T6SS, and these contributed to the expansion of their genomes. More gene clusters encoding secondary metabolites were found within the D. fangzhongdai strains than within the Pectobacterium complex; interestingly, distinct gene clusters encoding zeamine and arylpolyene were both most similar to those in D. solani that caused potato soft rot. These comparisons provided genomic evidences for that the newly emerging pathogen was potentially equipped to compete with other pathogens. Diagnostic qPCR verified that D. fangzhongdai was prevalent in most of the taro-growing areas and coexisted with the Pectobacterium complex, while the plants enriching D. fangzhongdai were frequently symptomatic at developing corms and adjacent pseudostems and caused severe symptoms. Thus, the emerging need for intensive monitoring on D. fangzhongdai to prevent it from spreading to other taro-growing areas and to other tuberous crops like potato; the adjustment of control strategies based on different pathopoiesis characteristics is recommended.
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Affiliation(s)
- Jingxin Zhang
- Plant Protection Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou, China
- Guangdong Provincial Key Laboratory of High Technology for Plant Protection, Guangzhou, China
- Key Laboratory of Green Prevention and Control on Fruits and Vegetables in South China, Ministry of Agriculture and Rural Affairs, Guangzhou, China
| | - Dayuan Sun
- Plant Protection Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou, China
- Guangdong Provincial Key Laboratory of High Technology for Plant Protection, Guangzhou, China
- Key Laboratory of Green Prevention and Control on Fruits and Vegetables in South China, Ministry of Agriculture and Rural Affairs, Guangzhou, China
| | - Huifang Shen
- Plant Protection Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou, China
- Guangdong Provincial Key Laboratory of High Technology for Plant Protection, Guangzhou, China
- Key Laboratory of Green Prevention and Control on Fruits and Vegetables in South China, Ministry of Agriculture and Rural Affairs, Guangzhou, China
| | - Xiaoming Pu
- Plant Protection Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou, China
- Guangdong Provincial Key Laboratory of High Technology for Plant Protection, Guangzhou, China
- Key Laboratory of Green Prevention and Control on Fruits and Vegetables in South China, Ministry of Agriculture and Rural Affairs, Guangzhou, China
| | - Pingping Liu
- Plant Protection Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou, China
- Guangdong Provincial Key Laboratory of High Technology for Plant Protection, Guangzhou, China
- Key Laboratory of Green Prevention and Control on Fruits and Vegetables in South China, Ministry of Agriculture and Rural Affairs, Guangzhou, China
| | - Birun Lin
- Plant Protection Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou, China
- Guangdong Provincial Key Laboratory of High Technology for Plant Protection, Guangzhou, China
- Key Laboratory of Green Prevention and Control on Fruits and Vegetables in South China, Ministry of Agriculture and Rural Affairs, Guangzhou, China
| | - Qiyun Yang
- Plant Protection Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou, China
- Guangdong Provincial Key Laboratory of High Technology for Plant Protection, Guangzhou, China
- Key Laboratory of Green Prevention and Control on Fruits and Vegetables in South China, Ministry of Agriculture and Rural Affairs, Guangzhou, China
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Gonzalez-Tobon J, Helmann T, Stodghill P, Filiatrault M. Surviving the Potato Stems: Differences in Genes Required for Fitness by Dickeya dadantii and Dickeya dianthicola. PHYTOPATHOLOGY 2024; 114:1106-1117. [PMID: 38170668 DOI: 10.1094/phyto-09-23-0351-kc] [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: 01/05/2024]
Abstract
Bacteria belonging to the genus Dickeya cause blackleg and soft rot symptoms on many plant hosts, including potato. Although there is considerable knowledge about the genetic determinants that allow Dickeya to colonize host plants, as well as the genes that contribute to virulence, much is still unknown. To identify the genes important for fitness in potato stems, we constructed and evaluated randomly barcoded transposon mutant (RB-TnSeq) libraries of Dickeya dadantii and Dickeya dianthicola. We identified 169 and 157 genes important for growth in D. dadantii and D. dianthicola in stems, respectively. This included genes related to metabolic pathways, chemotaxis and motility, transcriptional regulation, transport across membranes, membrane biogenesis, detoxification mechanisms, and virulence-related genes, including a potential virulence cluster srfABC, c-di-GMP modulating genes, and pectin degradation genes. When we compared the results of the stem assay with other datasets, we identified genes important for growth in stems versus tubers and in vitro conditions. Additionally, our data showed differences in fitness determinants for D. dadantii and D. dianthicola. These data provide important insights into the mechanisms used by Dickeya when interacting with and colonizing plants and thus might provide targets for management.
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Affiliation(s)
- Juliana Gonzalez-Tobon
- Plant Pathology and Plant-Microbe Biology Section, School of Integrative Plant Science, Cornell University, Ithaca, NY 14853
| | - Tyler Helmann
- United States Department of Agriculture-Agricultural Research Service, Robert W. Holley Center for Agriculture and Health, Ithaca, NY 14853
| | - Paul Stodghill
- Plant Pathology and Plant-Microbe Biology Section, School of Integrative Plant Science, Cornell University, Ithaca, NY 14853
- United States Department of Agriculture-Agricultural Research Service, Robert W. Holley Center for Agriculture and Health, Ithaca, NY 14853
| | - Melanie Filiatrault
- Plant Pathology and Plant-Microbe Biology Section, School of Integrative Plant Science, Cornell University, Ithaca, NY 14853
- United States Department of Agriculture-Agricultural Research Service, Robert W. Holley Center for Agriculture and Health, Ithaca, NY 14853
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3
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Alič Š, Bačnik K, Dreo T. Retrospective survey of Dickeya fangzhongdai using a novel validated real-time PCR assay. Front Microbiol 2024; 14:1249955. [PMID: 38414710 PMCID: PMC10896844 DOI: 10.3389/fmicb.2023.1249955] [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: 06/29/2023] [Accepted: 12/27/2023] [Indexed: 02/29/2024] Open
Abstract
Dickeya fangzhongdai, an aggressive plant pathogen, causes symptoms on a variety of crops and ornamental plants including bleeding canker of Asian pear trees. Historical findings stress the need for a specific detection tool for D. fangzhongdai to prevent overlooking the pathogen or assigning it to general Dickeya spp. Therefore, a qualitative real-time PCR for specific detection of D. fangzhongdai has been developed and validated. The developed assay shows selectivity of 100%, diagnostic sensitivity of 76% and limit of detection with 95% confidence interval in plant matrices ranging from 311 to 2,275 cells/mL of plant extracts. The assay was successfully used in a retrospective survey of selected host plants of relevance to Europe and environmental niches relevant to D. fangzhongdai. Samples of potato tubers and plants, plants from the Malinae subtribe (apple, pear, quince, and Asian pear tree) and fresh surface water from Slovenia were analyzed. D. fangzhongdai was not detected in any plant samples, however, 12% of surface water samples were found to be positive.
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Affiliation(s)
| | | | - Tanja Dreo
- National Institute of Biology, Ljubljana, Slovenia
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Xie C, Gu W, Chen Z, Liang Z, Huang S, Zhang LH, Chen S. Polyamine signaling communications play a key role in regulating the pathogenicity of Dickeya fangzhongdai. Microbiol Spectr 2023; 11:e0196523. [PMID: 37874149 PMCID: PMC10715095 DOI: 10.1128/spectrum.01965-23] [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: 05/09/2023] [Accepted: 09/19/2023] [Indexed: 10/25/2023] Open
Abstract
IMPORTANCE Dickeya fangzhongdai is a newly identified plant bacterial pathogen with a wide host range. A clear understanding of the cell-to-cell communication systems that modulate the bacterial virulence is of key importance for elucidating its pathogenic mechanisms and for disease control. In this study, we present evidence that putrescine molecules from the pathogen and host plants play an essential role in regulating the bacterial virulence. The significance of this study is in (i) demonstrating that putrescine signaling system regulates D. fangzhongdai virulence mainly through modulating the bacterial motility and production of PCWD enzymes, (ii) outlining the signaling and regulatory mechanisms with which putrescine signaling system modulates the above virulence traits, and (iii) validating that D. fangzhongdai could use both arginine and ornithine pathways to synthesize putrescine signals. To our knowledge, this is the first report to show that putrescine signaling system plays a key role in modulating the pathogenicity of D. fangzhongdai.
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Affiliation(s)
- Congcong Xie
- National Key Laboratory of Green Pesticide, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, South China Agricultural University Integrative Microbiology Research Centre, Guangzhou, China
| | - Weihan Gu
- National Key Laboratory of Green Pesticide, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, South China Agricultural University Integrative Microbiology Research Centre, Guangzhou, China
| | - Zhongqiao Chen
- National Key Laboratory of Green Pesticide, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, South China Agricultural University Integrative Microbiology Research Centre, Guangzhou, China
| | - Zhibin Liang
- National Key Laboratory of Green Pesticide, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, South China Agricultural University Integrative Microbiology Research Centre, Guangzhou, China
| | - Shufen Huang
- National Key Laboratory of Green Pesticide, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, South China Agricultural University Integrative Microbiology Research Centre, Guangzhou, China
| | - Lian-Hui Zhang
- National Key Laboratory of Green Pesticide, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, South China Agricultural University Integrative Microbiology Research Centre, Guangzhou, China
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, China
| | - Shaohua Chen
- National Key Laboratory of Green Pesticide, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, South China Agricultural University Integrative Microbiology Research Centre, Guangzhou, China
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5
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DeLude A, Wells R, Boomla S, Chuang SC, Urena F, Shipman A, Rubas N, Kuehu DL, Bickerton B, Peterson T, Dobhal S, Arizala D, Klair D, Ochoa-Corona F, Ali ME, Odani J, Bingham JP, Jenkins DM, Fletcher J, Stack JP, Alvarez AM, Arif M. Loop-mediated isothermal amplification (LAMP) assay for specific and rapid detection of Dickeya fangzhongdai targeting a unique genomic region. Sci Rep 2022; 12:19193. [PMID: 36357509 PMCID: PMC9649655 DOI: 10.1038/s41598-022-22023-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Accepted: 10/07/2022] [Indexed: 11/11/2022] Open
Abstract
Dickeya fangzhongdai, a bacterial pathogen of taro (Colocasia esculenta), onion (Allium sp.), and several species in the orchid family (Orchidaceae) causes soft rot and bleeding canker diseases. No field-deployable diagnostic tool is available for specific detection of this pathogen in different plant tissues. Therefore, we developed a field-deployable loop-mediated isothermal amplification (LAMP) assay using a unique genomic region, present exclusively in D. fangzhongdai. Multiple genomes of D. fangzhongdai, and other species of Dickeya, Pectobacterium and unrelated genera were used for comparative genomic analyses to identify an exclusive and conserved target sequence from the major facilitator superfamily (MFS) transporter gene region. This gene region had broad detection capability for D. fangzhongdai and thus was used to design primers for endpoint PCR and LAMP assays. In-silico validation showed high specificity with D. fangzhongdai genome sequences available in the NCBI GenBank genome database as well as the in-house sequenced genome. The specificity of the LAMP assay was determined with 96 strains that included all Dickeya species and Pectobacterium species as well as other closely related genera and 5 hosts; no false positives or false negatives were detected. The detection limit of the assay was determined by performing four sensitivity assays with tenfold serially diluted purified genomic DNA of D. fangzhongdai with and without the presence of crude host extract (taro, orchid, and onion). The detection limit for all sensitivity assays was 100 fg (18-20 genome copies) with no negative interference by host crude extracts. The assays were performed by five independent operators (blind test) and on three instruments (Rotor-Gene, thermocycler and dry bath); the assay results were concordant. The assay consistently detected the target pathogen from artificially inoculated and naturally infected host samples. The developed assay is highly specific for D. fangzhongdai and has applications in routine diagnostics, phytosanitary and seed certification programs, and epidemiological studies.
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Affiliation(s)
- Anuhea DeLude
- grid.410445.00000 0001 2188 0957Department of Plant and Environmental Protection Sciences, University of Hawaii at Manoa, Honolulu, HI USA
| | - Riley Wells
- grid.410445.00000 0001 2188 0957Department of Molecular Biosciences and Bioengineering, University of Hawaii at Manoa, Honolulu, HI USA
| | - Sherine Boomla
- grid.410445.00000 0001 2188 0957Department of Molecular Biosciences and Bioengineering, University of Hawaii at Manoa, Honolulu, HI USA
| | - Shu-Cheng Chuang
- grid.410445.00000 0001 2188 0957Department of Plant and Environmental Protection Sciences, University of Hawaii at Manoa, Honolulu, HI USA
| | - Frank Urena
- grid.410445.00000 0001 2188 0957Department of Molecular Biosciences and Bioengineering, University of Hawaii at Manoa, Honolulu, HI USA ,grid.410445.00000 0001 2188 0957Department of Cell and Molecular Biology, University of Hawaii at Manoa, Honolulu, HI USA
| | - Aaron Shipman
- grid.410445.00000 0001 2188 0957Department of Plant and Environmental Protection Sciences, University of Hawaii at Manoa, Honolulu, HI USA
| | - Noelle Rubas
- grid.410445.00000 0001 2188 0957Department of Molecular Biosciences and Bioengineering, University of Hawaii at Manoa, Honolulu, HI USA
| | - Donna Lee Kuehu
- grid.410445.00000 0001 2188 0957Department of Molecular Biosciences and Bioengineering, University of Hawaii at Manoa, Honolulu, HI USA ,grid.410445.00000 0001 2188 0957Department of Cell and Molecular Biology, University of Hawaii at Manoa, Honolulu, HI USA
| | - Buster Bickerton
- grid.410445.00000 0001 2188 0957Department of Molecular Biosciences and Bioengineering, University of Hawaii at Manoa, Honolulu, HI USA
| | - Taylor Peterson
- grid.410445.00000 0001 2188 0957Department of Human Nutrition, Food and Animal Sciences, University of Hawaii at Manoa, Honolulu, HI USA
| | - Shefali Dobhal
- grid.410445.00000 0001 2188 0957Department of Plant and Environmental Protection Sciences, University of Hawaii at Manoa, Honolulu, HI USA
| | - Dario Arizala
- grid.410445.00000 0001 2188 0957Department of Plant and Environmental Protection Sciences, University of Hawaii at Manoa, Honolulu, HI USA
| | - Diksha Klair
- grid.410445.00000 0001 2188 0957Department of Plant and Environmental Protection Sciences, University of Hawaii at Manoa, Honolulu, HI USA
| | - Francisco Ochoa-Corona
- grid.65519.3e0000 0001 0721 7331Institute for Biosecurity & Microbial Forensics, Oklahoma State University, Stillwater, OK USA
| | - Md Emran Ali
- grid.213876.90000 0004 1936 738XDepartment of Plant Pathology, University of Georgia, Tifton, GA USA
| | - Jenee Odani
- grid.410445.00000 0001 2188 0957Department of Human Nutrition, Food and Animal Sciences, University of Hawaii at Manoa, Honolulu, HI USA
| | - Jon-Paul Bingham
- grid.410445.00000 0001 2188 0957Department of Molecular Biosciences and Bioengineering, University of Hawaii at Manoa, Honolulu, HI USA
| | - Daniel M. Jenkins
- grid.410445.00000 0001 2188 0957Department of Molecular Biosciences and Bioengineering, University of Hawaii at Manoa, Honolulu, HI USA
| | - Jacqueline Fletcher
- grid.65519.3e0000 0001 0721 7331Institute for Biosecurity & Microbial Forensics, Oklahoma State University, Stillwater, OK USA
| | - James P. Stack
- grid.36567.310000 0001 0737 1259Department of Plant Pathology, Kansas State University, Manhattan, KS USA
| | - Anne M. Alvarez
- grid.410445.00000 0001 2188 0957Department of Plant and Environmental Protection Sciences, University of Hawaii at Manoa, Honolulu, HI USA
| | - Mohammad Arif
- grid.410445.00000 0001 2188 0957Department of Plant and Environmental Protection Sciences, University of Hawaii at Manoa, Honolulu, HI USA
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6
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Liang Z, Liu H, Xu Z, Zhang LH. First Report of Pectobacterium aroidearum Causing Soft Rot in Olecranon Honey Peach ( Prunus persica) in China. PLANT DISEASE 2022; 106:PDIS10212238PDN. [PMID: 34844444 DOI: 10.1094/pdis-10-21-2238-pdn] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Affiliation(s)
- Zhibin Liang
- Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou 510642, China
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou 510642, China
| | - Huidi Liu
- Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou 510642, China
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou 510642, China
| | - Zeling Xu
- Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou 510642, China
| | - Lian-Hui Zhang
- Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou 510642, China
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou 510642, China
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Zhou J, Hu M, Hu A, Li C, Ren X, Tao M, Xue Y, Chen S, Tang C, Xu Y, Zhang L, Zhou X. Isolation and Genome Analysis of Pectobacterium colocasium sp. nov. and Pectobacterium aroidearum, Two New Pathogens of Taro. FRONTIERS IN PLANT SCIENCE 2022; 13:852750. [PMID: 35557713 PMCID: PMC9088014 DOI: 10.3389/fpls.2022.852750] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Accepted: 03/28/2022] [Indexed: 06/15/2023]
Abstract
Bacterial soft rot is one of the most destructive diseases of taro (Colocasia esculenta) worldwide. In recent years, frequent outbreaks of soft rot disease have seriously affected taro production and became a major constraint to the development of taro planting in China. However, little is known about the causal agents of this disease, and the only reported pathogens are two Dickeya species and P. carotovorum. In this study, we report taro soft rot caused by two novel Pectobacterium strains, LJ1 and LJ2, isolated from taro corms in Ruyuan County, Shaoguan City, Guangdong Province, China. We showed that LJ1 and LJ2 fulfill Koch's postulates for taro soft rot. The two pathogens can infect taro both individually and simultaneously, and neither synergistic nor antagonistic interaction was observed between the two pathogens. Genome sequencing of the two strains indicated that LJ1 represents a novel species of the genus Pectobacterium, for which the name "Pectobacterium colocasium sp. nov." is proposed, while LJ2 belongs to Pectobacterium aroidearum. Pan-genome analysis revealed multiple pathogenicity-related differences between LJ1, LJ2, and other Pectobacterium species, including unique virulence factors, variation in the copy number and organization of Type III, IV, and VI secretion systems, and differential production of plant cell wall degrading enzymes. This study identifies two new soft rot Pectobacteriaceae (SRP) pathogens causing taro soft rot in China, reports a new case of co-infection of plant pathogens, and provides valuable resources for further investigation of the pathogenic mechanisms of SRP.
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Affiliation(s)
- Jianuan Zhou
- Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, China
| | - Ming Hu
- Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, China
| | - Anqun Hu
- Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, China
| | - Chuhao Li
- Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, China
| | - Xinyue Ren
- Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, China
| | - Min Tao
- Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, China
| | - Yang Xue
- Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, China
| | - Shanshan Chen
- Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, China
| | - Chongzhi Tang
- Guangdong Tianhe Agricultural Means of Production Co., Ltd., Guangzhou, China
| | - Yiwu Xu
- Guangdong Tianhe Agricultural Means of Production Co., Ltd., Guangzhou, China
- Qingyuan Agricultural Science and Technology Service Co., Ltd., Qingyuan, China
| | - Lianhui Zhang
- Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, China
| | - Xiaofan Zhou
- Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, China
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8
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Hu A, Hu M, Chen S, Xue Y, Tan X, Zhou J. Five Plant Natural Products Are Potential Type III Secretion System Inhibitors to Effectively Control Soft-Rot Disease Caused by Dickeya. Front Microbiol 2022; 13:839025. [PMID: 35273588 PMCID: PMC8901885 DOI: 10.3389/fmicb.2022.839025] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2021] [Accepted: 02/01/2022] [Indexed: 11/23/2022] Open
Abstract
Dickeya zeae, a plant soft-rot pathogen, possesses a type III secretion system (T3SS) as one of the major virulence factors, infecting a wide variety of monocotyledonous and dicotyledonous plants and causing serious losses to the production of economic crops. In order to alleviate the problem of pesticide resistance during bacterial disease treatment, compounds targeting at T3SS have been screened using a hrpA-gfp bioreporter. After screening by Multifunctional Microplate Reader and determining by flow cytometer, five compounds including salicylic acid (SA), p-hydroxybenzoic acid (PHBA), cinnamyl alcohol (CA), p-coumaric acid (PCA), and hydrocinnamic acid (HA) significantly inhibiting hrpA promoter activity without affecting bacterial growth have been screened out. All the five compounds reduced hypersensitive response (HR) on non-host tobacco leaves and downregulated the expression of T3SS, especially the master regulator encoding gene hrpL. Inhibition efficacy of the five compounds against soft rot were also evaluated and results confirmed that the above compounds significantly lessened the soft-rot symptoms caused by Dickeya dadantii 3937 on potato, Dickeya fangzhongdai CL3 on taro, Dickeya oryzae EC1 on rice, and D. zeae MS2 on banana seedlings. Findings in this study provide potential biocontrol agents for prevention of soft-rot disease caused by Dickeya spp.
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Affiliation(s)
| | | | | | | | | | - Jianuan Zhou
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Center, South China Agricultural University, Guangzhou, China
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