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dc.contributor.authorDalmannsdottir, Sigridur
dc.contributor.authorJørgensen, Marit
dc.contributor.authorRapacz, Marcin
dc.contributor.authorØstrem, Liv
dc.contributor.authorLarsen, Arild
dc.contributor.authorRødven, Rolf
dc.contributor.authorRognli, Odd Arne
dc.date.accessioned2018-04-17T12:18:14Z
dc.date.available2018-04-17T12:18:14Z
dc.date.issued2017-02-01
dc.description.abstractThe effect of variable autumn temperatures in combination with decreasing irradiance and daylength on photosynthesis, growth cessation and freezing tolerance was investigated in northern- and southern3 adapted populations of perennial ryegrass (Lolium perenne L.) and timothy (Phleum pratense L.) intended for use in regions at northern high latitudes. Plants were subjected to three different acclimation temperatures; 12, 6 and 9/3˚C (day/night) for four weeks, followed by one week of cold acclimation at 2˚C under natural light conditions. This experimental setup was repeated at three different periods during autumn with decreasing sums of irradiance and daylengths. Photoacclimation, leaf elongation and freezing tolerance were studied. The results showed that plants cold acclimated during the period with lowest irradiance and shortest day had lowest freezing tolerance, lowest photosynthetic activity, longest leaves and least biomass production. Higher acclimation temperature (12˚C) resulted in lower freezing tolerance, lower photosynthetic activity, faster leaf elongation rate and higher biomass compared to the other temperatures. Photochemical mechanisms were predominant in photoacclimation. The northern-adapted populations had a better freezing tolerance than the southern-adapted except when grown during the late autumn period and at the highest temperature; then there were no differences between the populations. Our results indicate that the projected climate change in the north may reduce freezing tolerance in grasses as acclimation will take place at higher temperatures and shorter daylengths with lower irradiance.en_US
dc.descriptionThis is the peer reviewed version of the following article: Dalmannsdottir, S., Jørgensen, M., Rapacz, M., Østrem, L., Larsen, A., Rødven, R. & Rognli, O. A. (2017). Cold acclimation in warmer extended autumns impairs freezing tolerance of perennial ryegrass (Lolium perenne) and timothy (Phleum pratense). Physiologia Plantarum: An International Journal for Plant Biology, 160(3), 266-281, which has been published in final form at <a href=http://doi.org/10.1111/ppl.12548> http://doi.org/10.1111/ppl.12548.</a> This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.en_US
dc.identifier.citationDalmannsdottir, S., Jørgensen, M., Rapacz, M., Østrem, L., Larsen, A., Rødven, R. & Rognli, O. A. (2017). Cold acclimation in warmer extended autumns impairs freezing tolerance of perennial ryegrass (Lolium perenne) and timothy (Phleum pratense). Physiologia Plantarum : An International Journal for Plant Biology, 160(3), 266-281. http://doi.org/10.1111/ppl.12548en_US
dc.identifier.cristinIDFRIDAID 1489008
dc.identifier.doi10.1111/ppl.12548
dc.identifier.issn0031-9317
dc.identifier.issn1399-3054
dc.identifier.urihttps://hdl.handle.net/10037/12535
dc.language.isoengen_US
dc.publisherWileyen_US
dc.relation.journalPhysiologia Plantarum : An International Journal for Plant Biology
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/MATPROG/199664/Norway/Understanding the genetic and physiological basis for adaption of Norwegian perennial forage crops to future climates//en_US
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/BIONÆR/199664/Norway/Understanding the genetic and physiological basis for adaption of Norwegian perennial forage crops to future climates//en_US
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Plantefysiologi: 492en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Plantefysiologi: 492en_US
dc.titleCold acclimation in warmer extended autumns impairs freezing tolerance of perennial ryegrass (Lolium perenne) and timothy (Phleum pratense)en_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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