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Priming of inducible defenses protects Norway spruce against tree-killing bark beetles
Norwegian Inst Bioecon Res, Dept Mol Plant Biol, N-1431 As, Norway..
Norwegian Inst Bioecon Res, Dept Mol Plant Biol, N-1431 As, Norway..
Swedish Univ Agr Sci, Dept Ecol, S-75007 Uppsala, Sweden..
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry. (Ecol Chem Grp)
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2020 (English)In: Plant, Cell and Environment, ISSN 0140-7791, E-ISSN 1365-3040, Vol. 43, no 2, p. 420-430Article in journal (Refereed) Published
Abstract [en]

Plants can form an immunological memory known as defense priming, whereby exposure to a priming stimulus enables quicker or stronger response to subsequent attack by pests and pathogens. Such priming of inducible defenses provides increased protection and reduces allocation costs of defense. Defense priming has been widely studied for short-lived model plants such as Arabidopsis, but little is known about this phenomenon in long-lived plants like spruce. We compared the effects of pretreatment with sublethal fungal inoculations or application of the phytohormone methyl jasmonate (MeJA) on the resistance of 48-year-old Norway spruce (Picea abies) trees to mass attack by a tree-killing bark beetle beginning 35 days later. Bark beetles heavily infested and killed untreated trees but largely avoided fungus-inoculated trees and MeJA-treated trees. Quantification of defensive terpenes at the time of bark beetle attack showed fungal inoculation induced 91-fold higher terpene concentrations compared with untreated trees, whereas application of MeJA did not significantly increase terpenes. These results indicate that resistance in fungus-inoculated trees is a result of direct induction of defenses, whereas resistance in MeJA-treated trees is due to defense priming. This work extends our knowledge of defense priming from model plants to an ecologically important tree species.

Place, publisher, year, edition, pages
WILEY , 2020. Vol. 43, no 2, p. 420-430
Keywords [en]
defense priming, Ips typographus, methyl jasmonate, Picea abies, resistance
National Category
Agricultural Science, Forestry and Fisheries
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URN: urn:nbn:se:kth:diva-267146DOI: 10.1111/pce.13661ISI: 000507304500010PubMedID: 31677172Scopus ID: 2-s2.0-85075443672OAI: oai:DiVA.org:kth-267146DiVA, id: diva2:1393459
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QC 20200217

Available from: 2020-02-17 Created: 2020-02-17 Last updated: 2020-02-17Bibliographically approved

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Borg-Karlson, Anna-Karin

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