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Lars Sandved Dalen

Senior Adviser

NIBIO Publications

Department of Communications

(+47) 990 08 564
lars.dalen@nibio.no

Place
Ås H7

Visiting address
Høgskoleveien 7, 1433 Ås

Links

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Biography

Plant Biologist, Science Communicator and non-fiction author.

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Authors

Lars Sandved Dalen

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Stein Michael Tomter Knut Øistad Lars Sandved Dalen Bjørn Helge Bjørnstad

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Lars Sandved Dalen

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Lars Sandved Dalen Øystein Johnsen Anders Lönneborg Mahmoud W. Yaish

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Paal Krokene E. Lahr Lars Sandved Dalen Tore Skrøppa Halvor Solheim

Abstract

Ceratocystis polonica and Heterobasidion parviporum are important fungal pathogens in Norway spruce (Picea abies). Tree susceptibility to these pathogens with respect to phenology was studied using artificial fungal inoculations at six stages of bud development, and assessed by measuring phloem necroses in the stems of 2- and 8-year-old trees. Tree capacity for resistance was assessed by measuring phloem nonstructural carbohydrates at each stage. Phloem necroses were significantly larger in trees with fungal versus control inoculations and increased significantly over time. Changes in nonstructural carbohydrates occurred in the trees; a significant decline in starch and a slight but significant increase in total sugars occurred over time. These results suggest that susceptibility to fungal pathogens and carbohydrate levels in the stems of the trees were related to fine-scale changes in bud development. A trade-off may occur between allocation of starch (the major fraction of the stem carbohydrate pool) to bud development/shoot growth versus defence of the stem. Previous tests of plant defence hypotheses have focused on herbivory on plants growing under different environmental conditions, but the role of phenology and the effect of pathogens are also important to consider in understanding plant resource allocation patterns.

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Authors

Carl Gunnar Fossdal Nina Elisabeth Nagy Øystein Johnsen Lars Sandved Dalen

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Lars Sandved Dalen Heather Danforth John Einset Carl Gunnar Fossdal Aksel Granhus Harald Kvaalen Nina Elisabeth Nagy Paivi Liisa Rinne Linda Ripel Sissel Torre Gunnhild Søgaard Christiaan van der Schoot

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Lars Sandved Dalen Øystein Johnsen

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Nina Elisabeth Nagy Lars Sandved Dalen D. L. Jones B. Swensen Carl Gunnar Fossdal Toril Eldhuset

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Nina Elisabeth Nagy Carl Gunnar Fossdal Lars Sandved Dalen Anders Lønneborg Inger Heldal Øystein Johnsen

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Lars Sandved Dalen Gunnar Ogner Øystein Johnsen

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O. Janne Kjønaas Harald Aalde Lars Sandved Dalen Helen Agnes de Wit Toril Drabløs Eldhuset Bernt-Håvard Øyen

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Lars Sandved Dalen Øystein Johnsen Gunnar Ogner

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