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Rapid monoterpene induction promotes the susceptibility of a novel host pine to mountain pine beetle colonization but not to beetle-vectored fungi

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dc.contributor.authorCale, Jonathan A
dc.contributor.authorMuskens, Marlena
dc.contributor.authorNajar, Ahmed
dc.contributor.authorIshangulyyvena, Guncha
dc.contributor.authorHussain, Altaf
dc.contributor.authorKanekar, Sanat S
dc.contributor.authorKlutsch, Jennifer G
dc.contributor.authorTaft, Spencer
dc.contributor.authorErbilgin, Nadir
dc.date.accessioned2025-05-01T12:30:49Z
dc.date.available2025-05-01T12:30:49Z
dc.date.issued2017-12-01
dc.descriptionChemical induction can drive tree susceptibility to and host range expansions of attacking insects and fungi. Recently, mountain pine beetle (Dendroctonus ponderosae Hopkins; MPB) has expanded its host range from its historic host lodgepole pine (Pinus contorta var. latifolia Douglas ex Loudon) to jack pine (Pinus banksiana Lamb) in western Canada. Beetle success in jack pine forests likely depends upon the suitability of tree chemistry to MPB and its symbiotic phytopathogenic fungi. In particular, how rapid induced defenses of jack pine affect MPB colonization and the beetle’s symbionts is unknown. In the field, we characterized and compared differences in rapid induced phloem monoterpenes between lodgepole and jack pines in response to various densities of Grosmannia clavigera (Robinson-Jeffery and Davidson)—a MPB symbiotic fungus used to simulate beetle attack—inoculations. Overall, lodgepole pine had higher limonene and myrcene, but lower α-pinene, concentrations than jack pine. However, myrcene concentrations in jack pine increased with inoculation density, while that in lodgepole pine did not respond to density treatments. We compared the growth and reproduction of MPB’s symbiotic fungi, G. clavigera, Ophiostoma montium (Rumford) von Arx and Leptographium longiclavatum Lee, Kim and Breuil, grown on media amended with myrcene, α-pinene and limonene at concentrations reflecting two induction levels from each pine species. Myrcene and α-pinene amendments inhibited the growth but stimulated the reproduction of G. clavigera, whereas limonene stimulated its growth while inhibiting its reproduction. However, the growth and reproduction of the other fungi were generally stimulated by monoterpene amendments. Overall, our results suggest that jack pine rapid induction could promote MPB aggregation due to high levels of α-pinene (pheromone precursor), a positive feedback of myrcene (pheromone synergist) and low levels of limonene (resistance). Jack pine is likely as susceptible to MPBvectored fungi as lodgepole pine, indicating that jack pine induction will likely not adversely affect symbiont activities enough to inhibit the invasion of MPB into jack pine forests.
dc.identifier.doihttps://doi.org/10.7939/r3-arws-3j47
dc.language.isoen
dc.relation.isversionofCale, J.A., Muskens, M., Najar, A., Ishangulyyeva, G., Hussain, A., Kanekar, S.S., Klutsch, J.G., Taft, S., Erbilgin, N. 2017. Rapid monoterpene induction promotes the susceptibility of a novel host pine to mountain pine beetle colonization but not to beetle-vectored fungi. Tree Physiology, 37(12), 1597–1610.  https://doi.org/10.1093/treephys/tpx089
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/
dc.subjectBark beetle outbreak
dc.subjectInsect invasion
dc.subjectJack pine
dc.subjectLodgepole pine
dc.subjectOphiostomatoid fungi
dc.subjectRange expansion
dc.titleRapid monoterpene induction promotes the susceptibility of a novel host pine to mountain pine beetle colonization but not to beetle-vectored fungi
dc.typehttp://purl.org/coar/resource_type/c_6501 http://purl.org/coar/version/c_b1a7d7d4d402bcce http://purl.org/coar/version/c_71e4c1898caa6e32
ual.jupiterAccesshttp://terms.library.ualberta.ca/public

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