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Priming of inducible defenses protects Norway spruce against tree‐killing bark beetles
Department of Molecular Plant Biology,Norwegian Institute of Bioeconomy Research, Ås, Norway.
Department of Molecular Plant Biology,Norwegian Institute of Bioeconomy Research, Ås, Norway.
Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden.
Ecological Chemistry Group, Department of Chemistry, Royal Institute of Technology, Stockholm, Sweden.
Vise andre og tillknytning
2020 (engelsk)Inngår i: Plant, Cell and Environment, ISSN 0140-7791, E-ISSN 1365-3040, Vol. 43, nr 2, s. 420-430Artikkel i tidsskrift (Fagfellevurdert) 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 pre‐treatment with sub‐lethal 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 to untreated trees, while 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 while 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.

sted, utgiver, år, opplag, sider
John Wiley & Sons, 2020. Vol. 43, nr 2, s. 420-430
Emneord [en]
defense priming, Ips typographus, methyl jasmonate, Picea abies, resistance
HSV kategori
Forskningsprogram
Biologi
Identifikatorer
URN: urn:nbn:se:oru:diva-78303DOI: 10.1111/pce.13661ISI: 000507304500010PubMedID: 31677172Scopus ID: 2-s2.0-85075443672OAI: oai:DiVA.org:oru-78303DiVA, id: diva2:1374434
Merknad

Funding Agencies:

Research Council of Norway 249958/F20 249920

Tilgjengelig fra: 2019-12-01 Laget: 2019-12-01 Sist oppdatert: 2020-01-27bibliografisk kontrollert

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