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.
2004
Authors
Carl Gunnar Fossdal Øystein Johnsen Rüdiger Baumann Jørgen A. Mølmann Ola Gram Dæhlen Nina Elisabeth Nagy Tore SkrøppaAbstract
Research indicate that the female parents of Norway spruce adjust these timing events in their progeny according to the prevailing temperature conditions during seed development. Reproduction in a cold environment advances bud-set and cold acclimation in the autumn and dehardening and flushing in spring, whereas a warm reproductive environment delays these progeny traits by an unknown non-Mendelian mechanism. We have performed identical crosses in combination with timed temperature treatments during shorter and longer periods from female meiosis, pollen tube growth, syngamy and embryogenesis, tested the progenies for bud-set and frost hardiness, and concluded that the effect of temperature most likely is a response to accumulated heat during embryogenesis and seed maturation. Our first attempt to look for a molecular mechanism has revealed that transcription of PHYO, PHYP and PHYN and the class IV chitinase PaChi4 (using RealTime PCR) all show higher transcription levels in progenies born under cold conditions than their full-sibs born under warmer conditions. This result is consistent with preliminary findings that methylation of cytosine in total DNA is higher in progenies reproduce under warm conditions than their colder full-sib counterparts. If these observations are related to methylation, we may explain why progenies with a memory of a past time cold embryogenesis are more sensitive to short days than their full-sibs with a warmer embryonic history.
Authors
Lone Ross Gobakken Johan Mattsson Bjørn Jacobsen Fred G. EvansAbstract
No abstract has been registered
Authors
Ingrid OlesenAbstract
In spring 2003, the Nordic Gene Bank Farm Animals (NGH) proposed a follow up of the “Strategy for the conservation of genetic resources in the Nordic countries 2001-2004”. It was proposed to formulate criteria for sustainable animal breeding and guidelines for breeding organizations. Thus, the Norwegian Gene Resource Council decided to initiate the development of criteria for sustainable animal breeding and guidelines for breeding organizations in Norway.
Authors
Geir Wæhler GustavsenAbstract
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Authors
Tor J. JohansenAbstract
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Authors
Tore Skrøppa Øystein Johnsen Carl Gunnar Fossdal Rudiger Baumann Jørgen A. Mølmann Ola G Dæhlen Nina Elisabeth Nagy G Müller-StarckAbstract
No abstract has been registered
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Authors
Arne O. Stuanes Richard Wright Heleen A. de Wit Lars R. Hole Øyvind Kaste Jan MulderAbstract
No abstract has been registered