Publications
NIBIOs employees contribute to several hundred scientific articles and research reports every year. You can browse or search in our collection which contains references and links to these publications as well as other research and dissemination activities. The collection is continously updated with new and historical material.
2018
Authors
Ingeborg KlingenAbstract
No abstract has been registered
Abstract
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Authors
Aritz Royo-Esnal Donato Loddo Jevgenija Necajeva Peter Kryger Jensen Friederike De Mol Garifalia Economou Alireza Taab Anna Bochenek Agnieszka Synowiec Isabel Calha Lars Andersson Ahmet Uludag Ilham Uremis Andrea Onofri Kirsten TørresenAbstract
No abstract has been registered
Authors
Jevgenija Necajeva Aritz Royo-Esnal Donato Loddo Peter Kryger Jensen Friederike De Mol Garifalia Economou Alireza Taab Anna Bochenek Agnieszka Synowiec Isabel Calha Lars Andersson Ahmet Uludag Ilham Uremis Kirsten TørresenAbstract
No abstract has been registered
Abstract
No abstract has been registered
Authors
C. Rikard Unelius S Ganji Christian Schiebe Tao Zhao Anna-Karin Borg-Karlson Bjørn Bohman Philip Weinstein Paal KrokeneAbstract
No abstract has been registered
Abstract
Yunnan pine is the most important tree species in SW China in both economical and ecological terms, but it is often killed by pine shoot beetles (Tomicus spp.). Tomicus beetles are secondary pests in temperate regions and the aggressiveness of the beetles in SW China is considered to be due to the warm subtropical climates as well as the beetles’ virulent fungal associates. Here, we assessed the virulence of three blue-stain fungi (Leptographium wushanense, L. sinense and Ophiostoma canum) associated with pine shoot beetles to Yunnan pine (Pinus yunnanensis) in SW China. Following fungal inoculation, we measured necrotic lesion lengths, antioxidant enzyme activities and monoterpene concentrations in the stem phloem of Yunnan pine. Leptographium wushanense induced twice as long lesions as L. sinense and O. canum, and all three fungi induced significantly longer lesions than sterile agar control inoculations. The activity of three tested antioxidant enzymes (peroxidase, polyphenol oxidase, and superoxide dismutase) increased after both fungal inoculation and control inoculation. However, L. wushanense and L. sinense generally caused a greater increase in enzyme activities than O. canum and the control treatment. Fungal inoculation induced stronger increases in six major monoterpenes than the control treatment, but the difference was significant only for some fungus-monoterpene combinations. Overall, our results show that L. wushanense and L. sinense elicit stronger defense responses and thus are more virulent to Yunnan pine than O. canum. The two Leptographium species may thus contribute to the aggressiveness of their beetle vectors and could damage Yunnan pine across SW China if they spread from the restricted geographical area they have been found in so far.
Authors
Paal KrokeneAbstract
No abstract has been registered
Authors
Paal KrokeneAbstract
No abstract has been registered
Authors
Tao Zhao Dineshkumar Kandasamy Paal Krokene Jingyuan Chen Jonathan Gershenzon Almuth HammerbacherAbstract
The bark beetle Ips typographus carries numerous fungi that could be assisting the beetle in colonizing live Norway spruce (Picea abies) trees. Phenolic defenses in spruce phloem are degraded by the beetle's major tree-killing fungus Endoconidiophora polonica, but it is unknown if other beetle associates can also catabolize these compounds. We compared the ability of five fungi commonly associated with I. typographus to degrade phenolic compounds in Norway spruce phloem. Grosmannia penicillata and Grosmannia europhioides were able to degrade stilbenes and flavonoids faster than E. polonica and grow on minimal growth medium with spruce bark constituents as the only nutrients. Furthermore, beetles avoided medium amended with phenolics but marginally preferred medium colonized by fungi. Taken together our results show that different bark beetle-associated fungi have complementary roles in degrading host metabolites and thus might improve this insect's persistence in well defended host tissues.