Cristin-resultat-ID: 1489008
Sist endret: 26. mars 2018, 15:32
NVI-rapporteringsår: 2017
Resultat
Vitenskapelig artikkel
2017

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

Bidragsytere:
  • Sigridur Dalmannsdottir
  • Marit Jørgensen
  • Marcin Rapacz
  • Liv Østrem
  • Arild Larsen
  • Rolf Rødven
  • mfl.

Tidsskrift

Physiologia Plantarum : An International Journal for Plant Biology
ISSN 0031-9317
e-ISSN 1399-3054
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2017
Volum: 160
Hefte: 3
Sider: 266 - 281
Open Access

Importkilder

Scopus-ID: 2-s2.0-85014480215

Beskrivelse Beskrivelse

Tittel

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

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 southern-adapted populations of perennial ryegrass (Lolium perenne) and timothy (Phleum pratense) 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 4 weeks, followed by 1 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 with 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.

Bidragsytere

Sigridur Dalmannsdottir

  • Tilknyttet:
    Forfatter
    ved Divisjon for matproduksjon og samfunn ved Norsk institutt for bioøkonomi
  • Tilknyttet:
    Forfatter
    ved Institutt for plantevitenskap ved Norges miljø- og biovitenskapelige universitet

Marit Jørgensen

  • Tilknyttet:
    Forfatter
    ved Divisjon for matproduksjon og samfunn ved Norsk institutt for bioøkonomi

Marcin Rapacz

  • Tilknyttet:
    Forfatter
    ved Uniwersytet Rolniczy im. Hugona Kollataja w Krakowie

Liv Østrem

  • Tilknyttet:
    Forfatter
    ved Divisjon for matproduksjon og samfunn ved Norsk institutt for bioøkonomi

Arild Larsen

  • Tilknyttet:
    Forfatter
    ved Graminor AS
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