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Fang Z, Zhao Q, Yang S, Cai Y, Fang W, Abubakar YS, Lin Y, Yun Y, Zheng W. Two distinct SNARE complexes mediate vesicle fusion with the plasma membrane to ensure effective development and pathogenesis of Fusarium oxysporum f. sp. cubense. MOLECULAR PLANT PATHOLOGY 2024; 25:e13443. [PMID: 38502146 PMCID: PMC10950013 DOI: 10.1111/mpp.13443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Revised: 01/19/2024] [Accepted: 02/22/2024] [Indexed: 03/20/2024]
Abstract
SNAREs (soluble N-ethylmaleimide-sensitive factor attachment protein receptors) facilitate docking and fusion of vesicles with their target membranes, playing a crucial role in vesicle trafficking and exocytosis. However, the spatial assembly and roles of plasma membrane (PM)-associated SNAREs in phytopathogen development and pathogenicity are not clearly understood. In this study, we analysed the roles and molecular mechanisms of PM-associated SNARE complexes in the banana Fusarium wilt fungus Fusarium oxysporum f. sp. cubense tropical race 4 (FocTR4). Our findings demonstrate that FocSso1 is important for the fungal growth, conidiation, host penetration and colonization. Mechanistically, FocSso1 regulates protein secretion by mediating vesicle docking and fusion with the PM and hyphal apex. Interestingly, a FocSso1-FocSec9-FocSnc1 complex was observed to assemble not only at the fungal PM but also on the growing hyphal apex, facilitating exocytosis. FocSso2, a paralogue of FocSso1, was also found to form a ternary SNARE complex with FocSec9 and FocSnc1, but it mainly localizes to the PM in old hyphae. The functional analysis of this protein demonstrated that it is dispensable for the fungal growth but necessary for host penetration and colonization. The other subunits, FocSec9 and FocSnc1, are involved in the fungal development and facilitate host penetration. Furthermore, FocSso1 and FocSnc1 are functionally interdependent, as loss of FocSso1 leads to mis-sorting and degradation of FocSnc1 in the vacuole and vice versa. Overall, this study provides insight into the formation of two spatially and functionally distinct PM SNARE complexes and their involvement in vesicle exocytosis to regulate development and pathogenicity of FocTR4.
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Affiliation(s)
- Zhenyu Fang
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant ProtectionFujian Agriculture and Forestry UniversityFuzhouFujianChina
- Key Laboratory of Biopesticide and Chemical Biology, Ministry of Education, College of Plant ProtectionFujian Agriculture and Forestry UniversityFuzhouFujianChina
| | - Qiwen Zhao
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant ProtectionFujian Agriculture and Forestry UniversityFuzhouFujianChina
- Key Laboratory of Biopesticide and Chemical Biology, Ministry of Education, College of Plant ProtectionFujian Agriculture and Forestry UniversityFuzhouFujianChina
| | - Shiyu Yang
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant ProtectionFujian Agriculture and Forestry UniversityFuzhouFujianChina
- Key Laboratory of Biopesticide and Chemical Biology, Ministry of Education, College of Plant ProtectionFujian Agriculture and Forestry UniversityFuzhouFujianChina
| | - Yan Cai
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant ProtectionFujian Agriculture and Forestry UniversityFuzhouFujianChina
- Key Laboratory of Biopesticide and Chemical Biology, Ministry of Education, College of Plant ProtectionFujian Agriculture and Forestry UniversityFuzhouFujianChina
| | - Wenqin Fang
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant ProtectionFujian Agriculture and Forestry UniversityFuzhouFujianChina
- Key Laboratory of Biopesticide and Chemical Biology, Ministry of Education, College of Plant ProtectionFujian Agriculture and Forestry UniversityFuzhouFujianChina
| | - Yakubu Saddeeq Abubakar
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant ProtectionFujian Agriculture and Forestry UniversityFuzhouFujianChina
- Key Laboratory of Biopesticide and Chemical Biology, Ministry of Education, College of Plant ProtectionFujian Agriculture and Forestry UniversityFuzhouFujianChina
- Department of Biochemistry, Faculty of Life SciencesAhmadu Bello UniversityZariaNigeria
| | - Ying Lin
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant ProtectionFujian Agriculture and Forestry UniversityFuzhouFujianChina
- School of Biological and Environmental EngineeringJingdezhen UniversityJingdezhenJiangxiChina
| | - Yingzi Yun
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant ProtectionFujian Agriculture and Forestry UniversityFuzhouFujianChina
- Key Laboratory of Biopesticide and Chemical Biology, Ministry of Education, College of Plant ProtectionFujian Agriculture and Forestry UniversityFuzhouFujianChina
| | - Wenhui Zheng
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, College of Plant ProtectionFujian Agriculture and Forestry UniversityFuzhouFujianChina
- Key Laboratory of Biopesticide and Chemical Biology, Ministry of Education, College of Plant ProtectionFujian Agriculture and Forestry UniversityFuzhouFujianChina
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O'Mara SP, Broz K, Schwister EM, Singh L, Dong Y, Elmore JM, Kistler HC. The Fusarium graminearum Transporters Abc1 and Abc6 Are Important for Xenobiotic Resistance, Trichothecene Accumulation, and Virulence to Wheat. PHYTOPATHOLOGY 2023; 113:1916-1923. [PMID: 37260101 DOI: 10.1094/phyto-09-22-0345-r] [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: 06/02/2023]
Abstract
The plant pathogenic fungus Fusarium graminearum is the causal agent of Fusarium head blight (FHB) disease on small-grain cereals. F. graminearum produces trichothecene mycotoxins such as deoxynivalenol (DON) that are required for full virulence. DON must be exported outside the cell to cause FHB disease, a process that may require the involvement of membrane-bound transporters. In this study, we show that the deletion of membrane-bound transporters results in reduced DON accumulation as well as reduced FHB symptoms on wheat. Deletion of the ATP-binding cassette (ABC) transporter gene Abc1 results in the greatest reduction in DON accumulation and virulence. Deletion of another ABC transporter gene, Abc6, also reduces FHB symptoms to a lesser degree. Combining deletions fails to reduce DON accumulation or virulence in an additive fashion, even when a ∆abc1 deletion is included. Heterologous expression of F. graminearum transporters in a DON-sensitive strain of yeast confirms Abc1 as a major DON resistance mechanism; furthermore, it suggests that Abc1 is directly participating in DON transport rather than facilitating DON transport though other means. Yeast expression further indicates that multiple transporters, including Abc1, play an important role in resistance to the wheat phytoalexin 2-benzoxazolinone (BOA) and other xenobiotics. Thus, Abc1 may contribute to virulence on wheat both by facilitating export of DON and by providing resistance to the wheat phytoalexin BOA. This research provides useful information that may aid in designing novel management techniques of FHB or other destructive plant diseases.
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Affiliation(s)
- Sean P O'Mara
- Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN 55108
| | - Karen Broz
- U.S. Department of Agriculture-Agricultural Research Service Cereal Disease Laboratory, St. Paul, MN 55108
| | - Erin M Schwister
- U.S. Department of Agriculture-Agricultural Research Service Cereal Disease Laboratory, St. Paul, MN 55108
| | - Lovepreet Singh
- Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN 55108
| | - Yanhong Dong
- Department of Plant Pathology, University of Minnesota, St. Paul, MN 55108
| | - J Mitch Elmore
- U.S. Department of Agriculture-Agricultural Research Service Cereal Disease Laboratory, St. Paul, MN 55108
- Department of Plant Pathology, University of Minnesota, St. Paul, MN 55108
| | - H Corby Kistler
- U.S. Department of Agriculture-Agricultural Research Service Cereal Disease Laboratory, St. Paul, MN 55108
- Department of Plant Pathology, University of Minnesota, St. Paul, MN 55108
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Garcia-Ceron D, Truong TT, Ratcliffe J, McKenna JA, Bleackley MR, Anderson MA. Metabolomic Analysis of Extracellular Vesicles from the Cereal Fungal Pathogen Fusarium graminearum. J Fungi (Basel) 2023; 9:jof9050507. [PMID: 37233218 DOI: 10.3390/jof9050507] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Revised: 04/19/2023] [Accepted: 04/22/2023] [Indexed: 05/27/2023] Open
Abstract
Fusarium graminearum (F. graminearum) is a filamentous fungus that infects cereals such as corn, wheat, and barley, with serious impact on yield as well as quality when the grain is contaminated with mycotoxins. Despite the huge impact of F. graminearum on food security and mammalian health, the mechanisms used by F. graminearum to export virulence factors during infection are not fully understood and may involve non-classical secretory pathways. Extracellular vesicles (EVs) are lipid-bound compartments produced by cells of all kingdoms that transport several classes of macromolecules and are implicated in cell-cell communication. EVs produced by human fungal pathogens carry cargo that facilitate infection, leading us to ask whether plant fungal pathogens also deliver molecules that increase virulence via EVs. We examined the metabolome of the EVs produced by F. graminearum to determine whether they carry small molecules that could modulate plant-pathogen interactions. We discovered that EVs from F. graminearum were produced in liquid medium-containing inducers of trichothecene production, but in lower quantities compared to other media. Nanoparticle tracking analysis and cryo-electron microscopy revealed that the EVs were morphologically similar to EVs from other organisms; hence, the EVs were metabolically profiled using LC-ESI-MS/MS. This analysis revealed that EVs carry 2,4-dihydroxybenzophenone (BP-1) and metabolites that have been suggested by others to have a role in host-pathogen interactions. BP-1 reduced the growth of F. graminearum in an in vitro assay, suggesting that F. graminearum might use EVs to limit metabolite self-toxicity.
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Affiliation(s)
- Donovan Garcia-Ceron
- Department of Biochemistry and Chemistry, La Trobe Institute for Molecular Science, La Trobe University, Bundoora 3086, Australia
| | - Thy T Truong
- Proteomics and Metabolomics Platform, School of Agriculture, Biomedicine, and Environment, La Trobe University, Bundoora 3086, Australia
| | - Julian Ratcliffe
- La Trobe Bioimaging Platform, La Trobe Institute for Molecular Science, La Trobe University, Bundoora 3086, Australia
| | - James A McKenna
- Department of Biochemistry and Chemistry, La Trobe Institute for Molecular Science, La Trobe University, Bundoora 3086, Australia
| | - Mark R Bleackley
- Department of Biochemistry and Chemistry, La Trobe Institute for Molecular Science, La Trobe University, Bundoora 3086, Australia
| | - Marilyn A Anderson
- Department of Biochemistry and Chemistry, La Trobe Institute for Molecular Science, La Trobe University, Bundoora 3086, Australia
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Identification and Transcriptional Profiling of SNARE Family in Monascus ruber M7 Reveal Likely Roles in Secondary Metabolism. FERMENTATION 2022. [DOI: 10.3390/fermentation8120750] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Soluble N-ethylmaleimide-sensitive factor attachment protein receptors (SNAREs) are the core components that mediate vesicle fusion, and they play an important role in secondary metabolism of filamentous fungi. However, in Monascus spp., one of the traditional medicinal and edible filamentous fungi, the members and function of SNAREs remain unknown. Here, twenty SNAREs in M. ruber M7 were systematically identified based on the gene structure, amino acid structure and phylogenetic analysis and were classified into four subfamilies. We also compared the expression profiles of twenty MrSNAREs in M. ruber M7 and its deletion mutants, ΔmrpigA and ΔpksCT, which could not produce Monascus pigment and citrinin, respectively. The results indicated that these MrSNAREs showed distinct expression patterns in the three strains. Compared to M. ruber M7, the expression levels of Mrtlg2, Mrbet1, Mrgos1 and Mrsec22 remained higher in ΔmrpigA but lower in ΔpksCT, which could be reason to consider them as potential candidate genes involved in secondary metabolism for further functional characterization. Further, the significant upregulation of Mrpep12 and Mrvtil in ΔpksCT is worthy of attention for further research. Our results provide systematic identification and expression profiling of the SNARE family in Monascus and imply that the functions of MrSNAREs are specific to different secondary metabolic processes.
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Rutter BD, Chu TTH, Dallery JF, Zajt KK, O'Connell RJ, Innes RW. The development of extracellular vesicle markers for the fungal phytopathogen Colletotrichum higginsianum. J Extracell Vesicles 2022; 11:e12216. [PMID: 35524440 PMCID: PMC9077143 DOI: 10.1002/jev2.12216] [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: 12/21/2021] [Revised: 03/11/2022] [Accepted: 03/30/2022] [Indexed: 11/24/2022] Open
Abstract
Fungal phytopathogens secrete extracellular vesicles (EVs) associated with enzymes and phytotoxic metabolites. While these vesicles are thought to promote infection, defining the true contents and functions of fungal EVs, as well as suitable protein markers, is an ongoing process. To expand our understanding of fungal EVs and their possible roles during infection, we purified EVs from the hemibiotrophic phytopathogen Colletotrichum higginsianum, the causative agent of anthracnose disease in multiple plant species, including Arabidopsis thaliana. EVs were purified in large numbers from the supernatant of protoplasts but not the supernatant of intact mycelial cultures. We purified two separate populations of EVs, each associated with over 700 detected proteins, including proteins involved in vesicle transport, cell wall biogenesis and the synthesis of secondary metabolites. We selected two SNARE proteins (Snc1 and Sso2) and one 14‐3‐3 protein (Bmh1) as potential EV markers and generated transgenic strains expressing fluorescent fusions. Each marker was confirmed to be protected inside EVs. Fluorescence microscopy was used to examine the localization of each marker during infection on Arabidopsis leaves. These findings further our understanding of EVs in fungal phytopathogens and will help build an experimental system to study EV interkingdom communication between plants and fungi.
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Affiliation(s)
- Brian D Rutter
- Department of Biology, Indiana University, Bloomington, Indiana, USA
| | - Thi-Thu-Huyen Chu
- Université Paris-Saclay, INRAE, UR BIOGER, Thiverval-Grignon, France.,University of Science and Technology of Hanoi, Vietnam Academy of Science and Technology, Hanoi, Vietnam
| | | | - Kamil K Zajt
- Department of Biology, Indiana University, Bloomington, Indiana, USA
| | | | - Roger W Innes
- Department of Biology, Indiana University, Bloomington, Indiana, USA
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Widmer TL, Costa JM. Impact of the United States Department of Agriculture, Agricultural Research Service on Plant Pathology: 2015-2020. PHYTOPATHOLOGY 2021; 111:1265-1276. [PMID: 33507089 DOI: 10.1094/phyto-09-20-0393-ia] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
There is an increasing need to supply the world with more food as the population continues to grow. Research on mitigating the effects of plant diseases to improve crop yield and quality can help provide more food without increasing the land area devoted to farming. National Program 303 (NP 303) within the U.S. Department of Agriculture, Agricultural Research Service is dedicated to research across multiple fields in plant pathology. This review article highlights the research impact within NP 303 between 2015 and 2020, including case studies on wheat and citrus diseases and the National Plant Disease Recovery System, which provide specific examples of this impact.
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Affiliation(s)
- Timothy L Widmer
- United States Department of Agriculture, Agricultural Research Service, Beltsville, MD 20705
| | - José M Costa
- United States Department of Agriculture, Agricultural Research Service, Beltsville, MD 20705
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Delivering the goods: Fungal secretion modulates virulence during host–pathogen interactions. FUNGAL BIOL REV 2021. [DOI: 10.1016/j.fbr.2021.03.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Tini F, Beccari G, Marconi G, Porceddu A, Sulyok M, Gardiner DM, Albertini E, Covarelli L. Identification of Putative Virulence Genes by DNA Methylation Studies in the Cereal Pathogen Fusarium graminearum. Cells 2021; 10:cells10051192. [PMID: 34068122 PMCID: PMC8152758 DOI: 10.3390/cells10051192] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Revised: 05/03/2021] [Accepted: 05/10/2021] [Indexed: 01/17/2023] Open
Abstract
DNA methylation mediates organisms’ adaptations to environmental changes in a wide range of species. We investigated if a such a strategy is also adopted by Fusarium graminearum in regulating virulence toward its natural hosts. A virulent strain of this fungus was consecutively sub-cultured for 50 times (once a week) on potato dextrose agar. To assess the effect of subculturing on virulence, wheat seedlings and heads (cv. A416) were inoculated with subcultures (SC) 1, 23, and 50. SC50 was also used to re-infect (three times) wheat heads (SC50×3) to restore virulence. In vitro conidia production, colonies growth and secondary metabolites production were also determined for SC1, SC23, SC50, and SC50×3. Seedling stem base and head assays revealed a virulence decline of all subcultures, whereas virulence was restored in SC50×3. The same trend was observed in conidia production. The DNA isolated from SC50 and SC50×3 was subject to a methylation content-sensitive enzyme and double-digest, restriction-site-associated DNA technique (ddRAD-MCSeEd). DNA methylation analysis indicated 1024 genes, whose methylation levels changed in response to the inoculation on a healthy host after subculturing. Several of these genes are already known to be involved in virulence by functional analysis. These results demonstrate that the physiological shifts following sub-culturing have an impact on genomic DNA methylation levels and suggest that the ddRAD-MCSeEd approach can be an important tool for detecting genes potentially related to fungal virulence.
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Affiliation(s)
- Francesco Tini
- Department of Agricultural, Food and Environmental Sciences, University of Perugia, Borgo XX Giugno, 74, 06121 Perugia, Italy; (F.T.); (G.B.); (E.A.); (L.C.)
| | - Giovanni Beccari
- Department of Agricultural, Food and Environmental Sciences, University of Perugia, Borgo XX Giugno, 74, 06121 Perugia, Italy; (F.T.); (G.B.); (E.A.); (L.C.)
| | - Gianpiero Marconi
- Department of Agricultural, Food and Environmental Sciences, University of Perugia, Borgo XX Giugno, 74, 06121 Perugia, Italy; (F.T.); (G.B.); (E.A.); (L.C.)
- Correspondence:
| | - Andrea Porceddu
- Department of Agriculture, University of Sassari, Viale Italia, 39a, 07100 Sassari, Italy;
| | - Micheal Sulyok
- Department of Agrobiotechnology (IFA-Tulln), University of Natural Resources and Applied Life Sciences, Vienna (BOKU), Konrad Lorenz Strasse, 20, A-3430 Tulln, Austria;
| | - Donald M. Gardiner
- Commonwealth Scientific and Industrial Research Organisation, Agriculture and Food, 306 Carmody Road, St Lucia, QLD 4067, Australia;
| | - Emidio Albertini
- Department of Agricultural, Food and Environmental Sciences, University of Perugia, Borgo XX Giugno, 74, 06121 Perugia, Italy; (F.T.); (G.B.); (E.A.); (L.C.)
| | - Lorenzo Covarelli
- Department of Agricultural, Food and Environmental Sciences, University of Perugia, Borgo XX Giugno, 74, 06121 Perugia, Italy; (F.T.); (G.B.); (E.A.); (L.C.)
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