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.
2008
Sammendrag
Mange skadeinsekter har liten betydning som skadegjørere ute i skogen. Noen av disse kan imidlertid gjøre stor skade når de opptrer på nyplantede trær i parker og alléer. I mange treplantinger brukes litt større trær, og jo større de er, jo høyere er risikoen for at de blir angrepet av skadeinsekter allerede i planteskolen. Planteskolene og mottakskontrollen bør derfor være svært nøye med å undersøke trærne før utplanting. Dette er særlig viktig ved import.
Sammendrag
Many bacteria produce antimicrobial substances such as nonribosomally synthesized antibiotics and ribosomally synthesized proteinaceous compounds referred to as bacteriocins. Secretion of antimicrobials is generally thought to contribute to the competitiveness of the producing organism, but there are indications that these compounds in some cases may have regulatory roles too. Bacteriocins most often act on closely related species only and are thus of interest for application as targeted narrow-spectrum antimicrobials with few side effects. Although the application of bacteriocins in plant disease control is an attractive option, very little is known about the occurrence and roles of these compounds in plant pathogenic bacteria and their natural competitors occurring in the same biotopes. This study presents an overview of current knowledge of bacteriocins from plant pathogenic bacteria.
Sammendrag
The Gram-positive bacterium Clavibacter michiganensis subsp. sepedonicus is the causal agent of bacterial wilt and ring rot of potato. So far, only two proteins have been shown to be essential for virulence, namely a plasmid-encoded cellulase CelA and a hypersensitive response-inducing protein. We have examined the relative expression of CelA and eight putative virulence factors during infection of potato and in liquid culture, using quantitative real-time PCR. The examined putative virulence genes were celB, a cellulase-encoding gene and genes encoding a pectate lyase, a xylanase and five homologues of the Clavibacter michiganensis subsp. michiganensis pathogenicity factor Pat-1 thought to encode a serine protease. Six of the nine assayed genes were up-regulated during infection of potato, including celA, celB, the xylanase gene, and two of the pat genes. The pectate lyase gene showed only slightly elevated expression, whereas three of the five examined pat genes were down-regulated during infection in potato. Interestingly, the two up-regulated pat genes showed a noticeable sequence difference compared to the three down-regulated pat genes. These results reveal several new proteins that are likely to be involved in Clavibacter michiganensis subsp. sepedonicus pathogenicity.
Forfattere
Hui Liu Sarah J. Coulthurst Leighton Pritchard Peter E. Hedley Michael Ravensdale Sonia Humphris Tom Burr Gunnhild Takle May Bente Brurberg Paul R.J. Birch George P.C. Salmond Ian K. TothSammendrag
Det er ikke registrert sammendrag
Sammendrag
In 1996, a survey on cavity spot started in Norway. Among the Pythium species isolated from the lesions a pathogenic Pythium was found that could not be identified neither by morphological nor by molecular methods (ITS sequencing). This Pythium sp. was repeatedly detected using specific primers developed for this propose and in many cases isolated from cavity spots lesions. The isolates from the new species do not produce zoospores. Oogonia are smooth walled and mostly intercalary with an average size about 20µm. Oospores are aplerotic with an average diameter approximately 17 µm and wall less then 2 µm thick. Antheridia are mostly monoclinous with a sort stalk or sessil, but diclinous antheridia are also common. The modal number of antheridia per oogonium is one or two. Some differences are observed between the isolates studied. Some isolates have a daily growth rate of ca 23 mm on PCA at 25 °C while others have a growth rate around 28 mm. The isolates that grow slower have a tendency to produce one antheridium per oogonium while the isolates with higher growth rates normally produce two. These two groups could also be differentiated based on their ITS sequences which showed 97.8% identity in the 955 base pair rDNA fragment. By using the developed PCR primers it is possible to detect isolates that do not produce the sexual stage in single cultures. These isolates have the same ITS sequence and a similar growth rate and pattern than the fast growing fertile ones.
Sammendrag
I 2004 Phytophthora capsici ble funnet i veksthusagurk i Norge.
Sammendrag
In 2006, a rust was found on a 20-year-old ornamental perennial Telekia speciosa in Ås, Akershus county, Norway. Diseased plants exhibited chlorotic spots on the upper leaf surface and uredinia and telia on the lower side of the leaf. This is the first report of C. telekiae in Norway
Forfattere
Venche TalgøSammendrag
Soppane Delphinella abietis and Herpotrichia parasitica gjer begge stor skade i nokre edelgranfelt på Vestlandet. Delphinella er mest utbreidd av dei to og gjer omfattande skade frå Hardanger og nordover. Begge soppane er luftborne og angrip nålene.
Forfattere
Venche TalgøSammendrag
Det er ikke registrert sammendrag
Forfattere
Venche TalgøSammendrag
Det er ikke registrert sammendrag