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.

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1993

Vitenskapelig artikkel – PR-proteins accumulating in spruce roots infected with a pathogenic Pythium sp. isolate include chitinases, chitosanases and -1,3-glucanases.

Praveen Sharma, Isabella Børja, Peter Stougaard, ...

Physiological and molecular plant pathology, 43, 1993

Forfattere

Praveen Sharma Isabella Børja Peter Stougaard Anders Lönneborg

Sammendrag

Root dieback of Picea abies (L) Karst., Norway spruce, seedlings is a serious problem in Scandinavian forest nurseries. We have chosen spruce seedlings infected with a pathogenic Pythium sp. isolate as an experimental system to study the interaction between the roots of a gymnosperm and a pathogen at the protein level. In this infection system, necroses on the hypocotyl and browning of the upper part of the roots appear within 2 days. Within 10 days the seedlings are completely wilted. Low pH soluble PR-proteins from infected and uninfected roots have been resolved on isoelectrofocusing (IEF) gels. Chitinases, chitosanases and β-1,3-glucanases have been detected enzymatically after IEF. Our results show that more than 30 different pathogenesis-related (PR) proteins accumulated in roots after pathogen infection. PR proteins of low and high isoelectric points appeared within 2 days after infection. In uninfected plants, only one acidic protein was detected. Eight different isoforms of chitinases accumulated after pathogen infection. Two acidic chitinases were constitutively expressed, and one of these strongly accumulated following pathogen infection. Three chitosanase activities were observed in infected plants, while no chitosanase activity was detected in uninfected plants. Also, no β-1,3-glucanase activity was observed in uninfected plants. One acidic β-1,3-glucanase was detected in infected roots after the second day of infection. A second acidic β-1,3-glucanase of relatively higher pI was detected on the fourth day. To our knowledge, this is the first report describing the response of gymnosperm roots to pathogen infection at the protein level. For the first time, we show that PR proteins accumulating after pathogen infection also include chitosanases. It can be concluded from our results that although gymnosperms are evolutionarily very distant from angiosperms, in terms of the production of PR proteins the response of gymnosperm roots resembles that observed in angiosperms.

Vitenskapelig artikkel – Predicting space use responses to habitat fragmentation: can voles Microtus oeconomus serve as an experimental model system (EMS) for capercaillie grouse Tetrao urogallus in boreal forest?

Rolf Anker Ims, Jørund Rolstad, Per Wegge

Biological Conservation, 63, 1993

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Forfattere

Rolf Anker Ims Jørund Rolstad Per Wegge

Sammendrag

Det er ikke registrert sammendrag

Vitenskapelig artikkel – Xiphydria prolongata (Fourcroy) (Hymenoptera, Xiphydriidae) new to the Norwegian fauna

Fred Midtgaard, Ove Sørlibråten

Fauna Norvegica, Serie B, 40, 1993

Forfattere

Fred Midtgaard Ove Sørlibråten

Sammendrag

Det er ikke registrert sammendrag

Vitenskapelig artikkel – The effect of an insect growth regulator on grasshoppers (Acrididae) and non-target arthropods in Mali

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