Polydomus karssenii gen. nov. sp. nov. is a dark septate endophyte with a bifunctional lifestyle parasitising eggs of plant parasitic cyst nematodes (Heterodera spp.)
Abstract In this study fungal strains were investigated, which had been isolated from eggs of the cereal cyst nematode Heterodera filipjevi, and roots of Microthlaspi perfoliatum (Brassicaceae). The morphology, the interaction with nematodes and plants and the phylogenetic relationships of these str...
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2023-03-01
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| Series: | IMA Fungus |
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| Online Access: | https://doi.org/10.1186/s43008-023-00113-w |
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| author | Samad Ashrafi Jan-Peer Wennrich Yvonne Becker Jose G. Maciá-Vicente Anke Brißke-Rode Matthias Daub Torsten Thünen Abdelfattah A. Dababat Maria R. Finckh Marc Stadler Wolfgang Maier |
| author_facet | Samad Ashrafi Jan-Peer Wennrich Yvonne Becker Jose G. Maciá-Vicente Anke Brißke-Rode Matthias Daub Torsten Thünen Abdelfattah A. Dababat Maria R. Finckh Marc Stadler Wolfgang Maier |
| author_sort | Samad Ashrafi |
| collection | DOAJ |
| description | Abstract In this study fungal strains were investigated, which had been isolated from eggs of the cereal cyst nematode Heterodera filipjevi, and roots of Microthlaspi perfoliatum (Brassicaceae). The morphology, the interaction with nematodes and plants and the phylogenetic relationships of these strains originating from a broad geographic range covering Western Europe to Asia Minor were studied. Phylogenetic analyses using five genomic loci including ITSrDNA, LSUrDNA, SSUrDNA, rpb2 and tef1-α were carried out. The strains were found to represent a distinct phylogenetic lineage most closely related to Equiseticola and Ophiosphaerella, and Polydomus karssenii (Phaeosphaeriaceae, Pleosporales) is introduced here as a new species representing a monotypic genus. The pathogenicity tests against nematode eggs fulfilled Koch’s postulates using in vitro nematode bioassays and showed that the fungus could parasitise its original nematode host H. filipjevi as well as the sugar beet cyst nematode H. schachtii, and colonise cysts and eggs of its hosts by forming highly melanised moniliform hyphae. Light microscopic observations on fungus-root interactions in an axenic system revealed the capacity of the same fungal strain to colonise the roots of wheat and produce melanised hyphae and microsclerotia-like structure typical for dark septate endophytes. Confocal laser scanning microscopy further demonstrated that the fungus colonised the root cells by predominant intercellular growth of hyphae, and frequent formation of appressorium-like as well as penetration peg-like structures through internal cell walls surrounded by callosic papilla-like structures. Different strains of the new fungus produced a nearly identical set of secondary metabolites with various biological activities including nematicidal effects irrespective of their origin from plants or nematodes. |
| format | Article |
| id | doaj-art-51a83904e9cd49008550029fed724a9c |
| institution | Kabale University |
| issn | 2210-6359 |
| language | English |
| publishDate | 2023-03-01 |
| publisher | BMC |
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| series | IMA Fungus |
| spelling | doaj-art-51a83904e9cd49008550029fed724a9c2025-02-03T06:51:45ZengBMCIMA Fungus2210-63592023-03-0114112010.1186/s43008-023-00113-wPolydomus karssenii gen. nov. sp. nov. is a dark septate endophyte with a bifunctional lifestyle parasitising eggs of plant parasitic cyst nematodes (Heterodera spp.)Samad Ashrafi0Jan-Peer Wennrich1Yvonne Becker2Jose G. Maciá-Vicente3Anke Brißke-Rode4Matthias Daub5Torsten Thünen6Abdelfattah A. Dababat7Maria R. Finckh8Marc Stadler9Wolfgang Maier10Institute for Epidemiology and Pathogen Diagnostics, Julius Kühn Institute (JKI) – Federal Research Centre for Cultivated PlantsDepartment Microbial Drugs, Helmholtz Centre for Infection ResearchInstitute for Epidemiology and Pathogen Diagnostics, Julius Kühn Institute (JKI) – Federal Research Centre for Cultivated PlantsPlant Ecology and Nature Conservation, Wageningen University and ResearchInstitute for Epidemiology and Pathogen Diagnostics, Julius Kühn Institute (JKI) – Federal Research Centre for Cultivated PlantsInstitute for Plant Protection in Field Crops and Grassland, Julius Kühn Institute (JKI) – Federal Research Centre for Cultivated PlantsInstitute for Crop and Soil Science, Julius Kühn Institute (JKI) – Federal Research Centre for Cultivated PlantsInternational Maize and Wheat Improvement Centre (CIMMYT), EmekDepartment of Ecological Plant Protection, University of KasselDepartment Microbial Drugs, Helmholtz Centre for Infection ResearchInstitute for Epidemiology and Pathogen Diagnostics, Julius Kühn Institute (JKI) – Federal Research Centre for Cultivated PlantsAbstract In this study fungal strains were investigated, which had been isolated from eggs of the cereal cyst nematode Heterodera filipjevi, and roots of Microthlaspi perfoliatum (Brassicaceae). The morphology, the interaction with nematodes and plants and the phylogenetic relationships of these strains originating from a broad geographic range covering Western Europe to Asia Minor were studied. Phylogenetic analyses using five genomic loci including ITSrDNA, LSUrDNA, SSUrDNA, rpb2 and tef1-α were carried out. The strains were found to represent a distinct phylogenetic lineage most closely related to Equiseticola and Ophiosphaerella, and Polydomus karssenii (Phaeosphaeriaceae, Pleosporales) is introduced here as a new species representing a monotypic genus. The pathogenicity tests against nematode eggs fulfilled Koch’s postulates using in vitro nematode bioassays and showed that the fungus could parasitise its original nematode host H. filipjevi as well as the sugar beet cyst nematode H. schachtii, and colonise cysts and eggs of its hosts by forming highly melanised moniliform hyphae. Light microscopic observations on fungus-root interactions in an axenic system revealed the capacity of the same fungal strain to colonise the roots of wheat and produce melanised hyphae and microsclerotia-like structure typical for dark septate endophytes. Confocal laser scanning microscopy further demonstrated that the fungus colonised the root cells by predominant intercellular growth of hyphae, and frequent formation of appressorium-like as well as penetration peg-like structures through internal cell walls surrounded by callosic papilla-like structures. Different strains of the new fungus produced a nearly identical set of secondary metabolites with various biological activities including nematicidal effects irrespective of their origin from plants or nematodes.https://doi.org/10.1186/s43008-023-00113-wEndophytesNematophagous fungiNew speciesPhylogenyPlant parasitic nematodesTaxonomy |
| spellingShingle | Samad Ashrafi Jan-Peer Wennrich Yvonne Becker Jose G. Maciá-Vicente Anke Brißke-Rode Matthias Daub Torsten Thünen Abdelfattah A. Dababat Maria R. Finckh Marc Stadler Wolfgang Maier Polydomus karssenii gen. nov. sp. nov. is a dark septate endophyte with a bifunctional lifestyle parasitising eggs of plant parasitic cyst nematodes (Heterodera spp.) IMA Fungus Endophytes Nematophagous fungi New species Phylogeny Plant parasitic nematodes Taxonomy |
| title | Polydomus karssenii gen. nov. sp. nov. is a dark septate endophyte with a bifunctional lifestyle parasitising eggs of plant parasitic cyst nematodes (Heterodera spp.) |
| title_full | Polydomus karssenii gen. nov. sp. nov. is a dark septate endophyte with a bifunctional lifestyle parasitising eggs of plant parasitic cyst nematodes (Heterodera spp.) |
| title_fullStr | Polydomus karssenii gen. nov. sp. nov. is a dark septate endophyte with a bifunctional lifestyle parasitising eggs of plant parasitic cyst nematodes (Heterodera spp.) |
| title_full_unstemmed | Polydomus karssenii gen. nov. sp. nov. is a dark septate endophyte with a bifunctional lifestyle parasitising eggs of plant parasitic cyst nematodes (Heterodera spp.) |
| title_short | Polydomus karssenii gen. nov. sp. nov. is a dark septate endophyte with a bifunctional lifestyle parasitising eggs of plant parasitic cyst nematodes (Heterodera spp.) |
| title_sort | polydomus karssenii gen nov sp nov is a dark septate endophyte with a bifunctional lifestyle parasitising eggs of plant parasitic cyst nematodes heterodera spp |
| topic | Endophytes Nematophagous fungi New species Phylogeny Plant parasitic nematodes Taxonomy |
| url | https://doi.org/10.1186/s43008-023-00113-w |
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