Publikasjoner
NIBIOs ansatte publiserer flere hundre vitenskapelige artikler og forskningsrapporter hvert år. Her finner du referanser og lenker til publikasjoner og andre forsknings- og formidlingsaktiviteter. Samlingen oppdateres løpende med både nytt og historisk materiale. For mer informasjon om NIBIOs publikasjoner, besøk NIBIOs bibliotek.
2011
Forfattere
Guro BrodalSammendrag
Det er ikke registrert sammendrag
Sammendrag
Current season needle necrosis (CSNN) has been a serious foliage disorder on noble fir (Abies procera), Normann fir (A. nordmanniana) and grand fir (A. grandis) in Europe and North America for more than 25 years. Approximately 2-4 weeks after bud break, needles develop chlorotic spots or bands that later turn necrotic. The symptoms were reported as a physiological disorder with unknown aetiology. In a recent study in Norway, Sydowia polyspora (anamorph: Hormonema dematioides) was found to cause CSNN. To determine if fungi found to cause diseases on fir (Abies spp.) might be seed borne, seed samples from Austria, Georgia, Russia, Canada and Norway were tested using agar plate methods. Some fungi were identified to species based on sequencing of ITS regions of rDNA. S polyspora was isolated from 10 of the 12 seed samples tested, representing all countries of the study. The fungus occurred in frequencies from 0.5 – 87%. Sirococcus conigenus, causing shoot blight of several conifer species, was found in a Norwegian A. procera seed lot (31% infected seeds), which to our knowledge is the first report of this pathogen on noble fir seed. Caloscypha fulgens, the seed or cold fungus, was recorded at low levels on subalpine fir from Canada. In addition the following fungus genera was recorded: Acremonium, Acremoniella, Alternaria, Aspergillus, Botrytis, Cephalosporium, Chaetomium, Cladosporium, Dictyopolyschema, Epicoccum, Fusarium, Genicularia, Mucor, Neonectria, Penicillium, Phoma, Rhizopus, Sordaria, Trichoderma and Trichothecium, and an unidentified fungus. Species within some of these fungal genera are known pathogens in nurseries and production fields. In 2009, we discovered S. polyspora on samples of pine and spruce seedlings from germination tests at the Norwegian Forest Seed Center. Due to these latter findings, we tested 44 conifer seed lots for S. polyspora this year. The main results will be presented. There is reason to consider seeds infected with S. polyspora as an important source of inoculum for infection of young trees. To reduce the damages in production fields, and to limit the risk of long distance spread of important seed borne diseases of conifers by international trade, seed health testing of fir seeds is recommended.
Forfattere
Nick Brake Simon JonesSammendrag
Despite concerted efforts, dengue is increasingly prevalent and without an effective vaccine. PlantVaccine is experimenting with a tobacco chloroplast expression system to develop a vaccine that is both effective and affordable .
Forfattere
Ingeborg KlingenSammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Ingeborg KlingenSammendrag
Det er ikke registrert sammendrag
Forfattere
Ingeborg KlingenSammendrag
Det er ikke registrert sammendrag
Forfattere
Ingeborg KlingenSammendrag
Det er ikke registrert sammendrag
Forfattere
Christer MagnussonSammendrag
The capacity for research and services in Plant Nematology has decreased much in the last 20 years. This is happening world wide and in the Nordic region the staff in Nematology has been reduced by 2/3 since 1994. We have already entered a situation where the capacity in most countries is insufficient to meet actual needs for research and development, as well as the needs for diagnostic services. Today the critical mass of the Nordic region is dangerously low. The scientific support required in decision making demonstrates a need to ensure the engagement of a sufficient number of nematologists. The present decrease in lecturing and training activities threatens recruitment and development. This situation can only be solved by an increase in research collaboration between Nordic countries.
Forfattere
Christer MagnussonSammendrag
Det er ikke registrert sammendrag