E
Erik Christiansen
Researcher at Forest Research Institute
Publications - 44
Citations - 5087
Erik Christiansen is an academic researcher from Forest Research Institute. The author has contributed to research in topics: Bark beetle & Picea abies. The author has an hindex of 29, co-authored 42 publications receiving 4745 citations. Previous affiliations of Erik Christiansen include Institut national de la recherche agronomique.
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Journal ArticleDOI
Induced Responses in Phenolic Metabolism in Two Norway Spruce Clones after Wounding and Inoculations with Ophiostoma polonicum, a Bark Beetle-Associated Fungus.
Franck Brignolas,Benoît Lacroix,F. Lieutier,Daniel Sauvard,Alain Drouet,Anne-Catherine Claudot,Annie Yart,Alan A. Berryman,Erik Christiansen +8 more
TL;DR: It is suggested that resistance to O. polonicum depends on the ability of the tree to easily activate the flavonoid pathway, finally leading to tannins and insoluble polymers in Norway spruce phloem.
Journal ArticleDOI
Specialized phloem parenchyma cells in Norway spruce (Pinaceae) bark are an important site of defense reactions.
TL;DR: Data show that polyphenolic parenchyma cells are active in synthesis, storage, and modification of phenolics in response to wounding, providing an important site of constitutive and inducible defenses.
Journal ArticleDOI
Mechanical injury and fungal infection induce acquired resistance in Norway spruce
Erik Christiansen,Paal Krokene,Alan A. Berryman,Vincent R. Franceschi,Trygve Krekling,F. Lieutier,Anders Lönneborg,Halvor Solheim +7 more
TL;DR: Norway spruce trees pretreated by wounding and fungal infection showed highly enhanced resistance to a subsequent challenge inoculation with the pathogenic bluestain fungus Ceratocystis polonica, for the first time the effectiveness of the constitutive and inducible defenses has been shown to depend on prior wounding and infection in conifers.
Artificial inoculation with Ips typographus-associated blue stain fungi can kill healthy Norway spruce trees
TL;DR: The results indicate that C. polonica is a highly qualified accomplice to [ps typographus in its killing of spruce trees.
Journal ArticleDOI
The threshold of successful attack by Ips typographus on Picea abies: a field experiment
Peter Mulock,Erik Christiansen +1 more
TL;DR: The spruce bark beetle, Ips typographus, was induced to attack Norway spruce by means of pheromone dispensers and the trees were later categorized as surviving or dying, according to the degree of sapwood blue-staining caused by the attacks.