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Cold acclimation in warmer extended autumns impairs freezing tolerance of perennial ryegrass (Lolium perenne) and timothy (Phleum pratense)

Permanent lenke
https://hdl.handle.net/10037/12535
DOI
https://doi.org/10.1111/ppl.12548
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article.pdf (502.4Kb)
Accepted manuscript version (PDF)
Dato
2017-02-01
Type
Journal article
Tidsskriftartikkel
Peer reviewed

Forfatter
Dalmannsdottir, Sigridur; Jørgensen, Marit; Rapacz, Marcin; Østrem, Liv; Larsen, Arild; Rødven, Rolf; Rognli, Odd Arne
Sammendrag
The 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.
Beskrivelse
This 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 http://doi.org/10.1111/ppl.12548. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Forlag
Wiley
Sitering
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. http://doi.org/10.1111/ppl.12548
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