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.
2021
Authors
Line Nybakken Inger Sundheim Fløistad Melissa Magerøy Maren Lomsdal Solveig Strålberg Paal Krokene Johan AsplundAbstract
Nursery-grown Norway spruce Picea abies seedlings are often heavily attacked by the pine weevil Hylobius abietis on clear-cuts the first years after planting. Because the seedlings are not resource-limited during the growing phase in the nursery they are expected to invest less in defence than naturally regenerated seedlings already present on the clear-cuts. The latter have had to cope with various environmental stressors that could make them invest more in defence. We tested if naturally regenerated plants have stronger chemical defences than nursery-grown plants. Nursery-grown plants were planted in-between naturally regenerated plants on fresh clear cuts, and phenolic and terpene compounds in the stem bark were measured after one growing season. To test both constitutive and inducible defences, plants were either wounded, painted with methyl jasmonate (MeJA) to induce defences, or given a combination of both treatments. Growth and pine weevil attacks of the plants were registered. Nursery-grown plants had higher total concentrations of phenolic compounds and lower concentrations of terpenes than naturally regenerated plants. These opposite responses were reflected in very different compound profiles in the two plant types. We suggest the differences between plant types to be results of differences in plant age, stress level, genetic origin or possibly a combination of these factors. Most compounds showed no response to wounding, MeJA-treatment or wounding and MeJA-treatment combined, but the terpenes 3-carene, eucalyptol, limonene and para-cymene had higher concentrations in MeJA-treated nursery-grown plants than in control plants. These compounds are known to be effective in conifer resistance against weevils and bark beetles. Overall, 27% of our 400 study plants had signs of pine weevil damage after 3 ½ months in the field. However, treatment or plant type had no significant effect on whether plants were attacked or not and this might have been a result of the relatively low overall level of attacks in this study. Further studies are needed to disentangle the importance of plant age, stress level, genetic origin and resource availability for chemical defence mechanisms of young Norway spruce plants, as strengthening the natural resistance of nursery plants may be increasingly important in a future with less pesticide use.
Authors
Vibeke LindAbstract
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Authors
Juliet Ochola Danny Coyne Laura Cortada Solveig Haukeland Margaret Ng'ang'a Ahmed Hassanali Charles Opperman Baldwyn TortoAbstract
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Authors
Martin S. Mullett Rein Drenkhan Kalev Adamson Piotr Boroń Anna Lenart-Boroń Irene Barnes Michal Tomšovský Zuzana Jánošíková Katarína Adamčíková Emília Ondrušková Valentin Queloz Barbara Piskur Dmitry L. Musolin Kateryna Davydenko Margarita Georgieva Sophie Schmitz Audrius Kačergius Luisa Ghelardini Jelena Kranjec Orlović Michael Müller Funda Oskay Tine Hauptman Ágnes Halász Svetlana Markovskaja Halvor Solheim Martti Vuorinen Renate Heinzelmann Richard C. Hamelin Adam KonečnýAbstract
No abstract has been registered
Authors
Ikumi Umetani Eshetu Janka Wakjera Michal Sposób Christopher Jonathan Hulatt Synne Kleiven Rune BakkeAbstract
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Authors
Ziyan Xu Yongjie Kuang Bin Ren Daqi Yan Fang Yan Carl Jonas Jorge Spetz Wenxian Sun Guirong Wang Xueping Zhou Huanbin ZhouAbstract
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Authors
Gillian Butler Bjørn Egil Flø Flaviana Gottardo Anna Hessle Matthias Koesling Elisabet Nadeau Carsten Malisch Giorgia Riuzzi Tomasz Sakowski Anna Woodhouse Finn Walland Håvard SteinshamnAbstract
No abstract has been registered