| Download | - View final version: Evidence that ophiostomatoid fungal symbionts of mountain pine beetle do not play a role in overcoming lodgepole pine defenses during mass attack (PDF, 6.2 MiB)
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| DOI | Resolve DOI: https://doi.org/10.1094/MPMI-06-23-0077-R |
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| Author | Search for: Fortier, Colleen E.1; Search for: Musso, Antonia E.1; Search for: Evenden, Maya L.1; Search for: Zaharia, L. Irina2; Search for: Cooke, Janice E. K.1ORCID identifier: https://orcid.org/0000-0002-4990-628X |
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| Affiliation | - University of Alberta
- National Research Council Canada. Aquatic and Crop Resource Development
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| Funder | Search for: Natural Sciences and Engineering Research Council of Canada; Search for: Alberta Agriculture and Forestry; Search for: fRI Research; Search for: Manitoba Conservation and Water Stewardship; Search for: Canadian Forest Service; Search for: Environment and Natural Resources, Northwest Territories; Search for: Ontario Ministry of Natural Resources and Forestry; Search for: Ministry of Environment - Saskatchewan; Search for: West Fraser; Search for: Weyerhaeuser; Search for: Genome Alberta; Search for: Genome Canada; Search for: Alberta Innovates; Search for: University of Alberta |
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| Format | Text, Article |
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| Subject | bark beetle; ethylene; jasmonic acid; phenolics; plant defense; Dendroctonus ponderosae; Grosmannia clavigera; Pinus contorta |
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| Abstract | Mountain pine beetle (MPB; Dendroctonus ponderosae Hopkins) is a devastating forest insect pest that has killed millions of hectares of pines in western North America over the past two decades. Like other bark beetles, MPB vectors ophiostomatoid fungal species, some of which are pathogenic to host pine species. The phytopathogenicity of these fungal symbionts has sparked considerable debate regarding their role in facilitating MPB attack success. We tested the hypothesis that MPB ophiostomatoid fungal associates like Grosmannia clavigera (Robinson-Jeffrey and Davidson) Zipfel, de Beer and Wingfield contribute to overwhelming host defenses during MPB mass attack. We compared responses of mature lodgepole pine ( Pinus contorta Dougl. ex Loud. var. latifolia Engelm.) trees growing in natural stands that were mass attacked by MPB with those inoculated with G. clavigera by examining host defense hormones, secondary metabolites, and gene expression profiles. The jasmonate and ethylene signatures of necrotrophic pathogen-triggered response were identified in G. clavigera-inoculated trees, but only the jasmonate signature of a herbivore-triggered response was measured in MPB-attacked trees. Several G. clavigera-induced changes in pine phenolic metabolite profiles and phenolic biosynthesis gene expression patterns were absent in MPB-attacked pines. These findings indicate that ophiostomatoid fungi like G. clavigera are not a major factor in overwhelming host defenses during MPB mass attack. Instead, fungal pathogenicity likely is more important in aiding MPB colonization and development within the host tree. Phenolics appear to play a larger role in the host response to G. clavigera than to MPB, although phenolics may also influence MPB feeding and behavior. |
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| Date published | 2024-05-22 |
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| Publisher | The American Phytopathological Society |
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| Language | English |
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| Peer reviewed | Yes |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | afe293ed-4329-42b4-b7a1-d07f8c901cb0 |
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| Record created | 2026-05-01 |
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| Record modified | 2026-06-22 |
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