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.
2026
Sammendrag
DNA methylation can change DNA properties, affecting chromatin accessibility, gene expression, and phenotypic variation. In clonal Norway spruce, warmer (WE) versus cooler (CE) embryogenic conditions produce phenotypically dif ferent trees. This climatic memory, induced during embryogenesis, remains stable in the resulting epitype trees, and the epigenetically altered timing of bud phenology persists between WE and CE epitypes even after decades under common garden conditions. We examined DNA methylation patterns in 14-year-old epitypes throughout the annual developmental cycle. Using targeted bisulfite sequencing, we screened for differential DNA methylation over a 3000 bp region in 2744 genes related to the epigenetic machinery, circadian clock, and phenology. Clustering DNA methylation differences in the CG context clearly separated epitype trees, confirming epigenetic mark differences. Differences in methylation of cytosines in all contexts were highly dynamic and varied markedly among annual developmental stages, suggesting the existence of circannual clocks affecting methylation levels in the studied genomic regions. Most stable methylation marks were identified in CG contexts, fewer in CHG and none in CHH contexts, consistent with differences in inheritance among methylation con texts. We identified stable CG and CHG methylation marks in the promoter regions of 30 specific genes. Two ARGONAUTE genes and 4 other genes exhibited stable marks across all time points for CE or WE, and putative embryo–adult transmission for some genes. These findings indicate that DNA methylation marks maintained in genomic regions throughout the annual cycle may contribute to an induced epigenetic memory established in embryos and later manifested as phenologically dif ferent epitype trees.
Forfattere
Junbin Zhao Mounir Takriti Per-Erik Jansson Ed Jones Mikhail Mastepanov Erling Fjelldal Cornelya Klutsch David Kniha Runar Kjær Simon Weldon Kjetil Fadnes Knut Bjørkelo Jonathan Rizzi Christian Wilhelm Mohr Gunnhild Søgaard Jagadeesh YeluripatiSammendrag
Abstract Peatlands drained for agriculture and other uses release substantial carbon dioxide. Many countries estimate these emissions using the 2014 IPCC Tier 1 emission factors. Here we calibrated an ecosystem model with data from two cultivated peatland sites in Norway and simulate carbon dioxide emissions at 50 sites nationwide for 2001–2022. Model results showed that carbon dioxide emissions were strongly controlled by water table depth and aligned well with observations from other European peatlands of similar climate zones. Crucially, the Tier 1 emission factor matched our simulations only under very deep water tables (< –0.7 m), but overestimated emissions by 31–88% when water levels ranged from –0.7 m to –0.3 m. This indicates that Tier 1 methods may overstate emissions from cultivated peatlands in cool temperate and boreal regions, inflating estimates of mitigation potential. Tier 2 or 3 approaches can reduce uncertainty but require more field data.
Forfattere
Frode VeggelandSammendrag
Det er ikke registrert sammendrag
Sammendrag
Naturopplevelser kommer i ulike formater. Ikke alle er store, imponerende eller eksotiske. Også de mindre og lokale kan ha stor verdi.
Sammendrag
Når sommervarmen ligger tung over byen, søker vi mot skyggen under et stort tre. Det er ikke tilfeldig. Trær fungerer som naturens eget klimaanlegg og bidrar til å gjøre byer mer levelige når temperaturene stiger.
Sammendrag
KRONIKK: Nå diskuterer vi igjen økt matproduksjon, økt effektivitet i landbruket og behovet for økt selvforsyning. Da er det grunn til å minne om erfaringene fra tidligere perioder med intensivering i denne næringa.
Forfattere
Jo Jorem AarsethSammendrag
Intervju om gås og problematikk rundt beiteskader og avføring på badestrand
Forfattere
Randi Berland FrøsethSammendrag
Presentasjon av hovedpunktene i Nasjonal strategi for økologisk jordbruk 2025-2032
Forfattere
Nina SvartedalSammendrag
Det er ikke registrert sammendrag
Forfattere
Trygve S. Aamlid Sigridur Dalmannsdottir Kristoffer Herland Hellton Marit Jørgensen Ievina Sturite Carl Gunnar Fossdal Akhil Reddy Pashapu Mallikarjuna Rao Kovi Helga Amdahl Odd Arne RognliSammendrag
Det er ikke registrert sammendrag