Publications
NIBIOs employees contribute to several hundred scientific articles and research reports every year. You can browse or search in our collection which contains references and links to these publications as well as other research and dissemination activities. The collection is continously updated with new and historical material.
2015
Abstract
No abstract has been registered
Authors
Tore SkrøppaAbstract
No abstract has been registered
Authors
Jørgen Dejgård Jensen Lartey Godwin Lawson Mogens LundAbstract
No abstract has been registered
Abstract
No abstract has been registered
Authors
Ivan N. Bolotov Yulia V. Bespalaya Ilya V. Vikhrev Olga V. Aksenova Paul Eric Aspholm Mikhail Y. Gofarov Olga K. Klishko Yulia S. Kolosova Alexander V. Kondakov Artyom A. Lyubas Inga S. Paltser Ekaterina S. Konopleva Sakboworn Tumpeesuwan Nikita I. Bolotov Irina S. VoroshilovaAbstract
No abstract has been registered
Authors
Sigridur Dalmannsdottir Marcin Rapacz Marit Jørgensen Liv Østrem Arild Larsen Rolf Rødven Odd Arne RognliAbstract
The expected temperature rise in late summer/early autumn can change the conditions for acclimation and affect the winter survival of perennial crops. This study examined the effect of the temperature just before the onset of cold acclimation (pre-acclimation) on freezing tolerance of timothy (Phleum pratense L.), perennial ryegrass (Lolium perenne L.) and red clover (Trifolium pratense L.) populations (both cultivars and breeding populations) adapted to either northern or southern parts of Norway. Using phytotron experiments, we studied whether increasing pre-acclimation temperature delays growth cessation, affects photoacclimation and reduces freezing tolerance. Furthermore, we assessed whether these effects were related to the latitudinal adaptation of the plant material. The results showed that a rise in pre-acclimation temperature decreased both cold acclimation capacity and photoacclimation in these species. This affected the freezing tolerance, which was reduced significantly more in northern-adapted population of timothy and perennial ryegrass compared with southern-adapted populations. Red clover was less affected by temperature changes than the grasses.
Authors
Christophe Moni Thomas Lerch Katrin Knoth Line Tau Strand Claudia Forte Giacomo Certini Daniel RasseAbstract
No abstract has been registered
Authors
Lise Tingstad Siri Lie Olsen Kari Klanderud Vigdis Vandvik Mikael OhlsonAbstract
Seedling recruitment is a critical life history stage for trees, and successful recruitment is tightly linked to both abiotic factors and biotic interactions. In order to better understand how tree species’ distributions may change in response to anticipated climate change, more knowledge of the effects of complex climate and biotic interactions is needed. We conducted a seed-sowing experiment to investigate how temperature, precipitation and biotic interactions impact recruitment of Scots pine (Pinus sylvestris) and Norway spruce (Picea abies) seedlings in southern Norway. Seeds were sown into intact vegetation and experimentally created gaps. To study the combined effects of temperature and precipitation, the experiment was replicated across 12 sites, spanning a natural climate gradient from boreal to alpine and from sub-continental to oceanic. Seedling emergence and survival were assessed 12 and 16 months after sowing, respectively, and aboveground biomass and height were determined at the end of the experiment. Interestingly, very few seedlings were detected in the boreal sites, and the highest number of seedlings emerged and established in the alpine sites, indicating that low temperature did not limit seedling recruitment. Site precipitation had an overall positive effect on seedling recruitment, especially at intermediate precipitation levels. Seedling emergence, establishment and biomass were higher in gap plots compared to intact vegetation at all temperature levels. These results suggest that biotic interactions in the form of competition may be more important than temperature as a limiting factor for tree seedling recruitment in the sub- and low-alpine zone of southern Norway.
Abstract
Epigenetic memory formed in the Norway spruce embryos permanently affect the timing of bud burst and bud set in the progenies, vitally important adaptive traits in this long-lived forest species. Epigenetic memory marks are established in response to the temperature conditions prevailing during embryogenesis; the epitype is fixed by the time the embryo is fully developed and is mitotically propagated throughout the tree’s life span. Somatic embryogenesis closely mimics the natural zygotic embryo formation and results in epigenetically different plants in a predictable temperature-dependent manner with respect to altered phenology. Using RNAseq transcriptome analysis of mRNA and noncodingRNA (ncRNA) changes were monitored in somatic embryos under different temperatures. We found distinct differences in mRNA and ncRNA transcriptomes between the genetically identical embryogenic tissues grown under the epitype-inducing temperatures suggesting temperature-dependent canalizing of gene expression during embryo formation, putatively based on chromatin modifications.
Abstract
No abstract has been registered