How do non-adaptive grasses control growth cessation during autumn in high latitude regions?
L. Ostrem , Marcin Rapacz , A. Larsen , S. Dalmannsdottir , M. Jorgensen
AbstractUse of perennial ryegrass (Lolium perenne) and ×Festulolium is expected to increase in highlatitude regions due to milder winters and a prolonged growing season. One main challenge is inadequate growth cessation in autumn to allow sufficient cold hardening. Possible mechanisms behind this were examined by measuring photosynthetic activity and growth rate in triple-replicate field trials at two sites in Norway: Fureneset (59°N) and Vågønes (67°N). Ten entries, including meadow fescue (Festuca pratensis), were investigated weekly from mid-September to early December 2011 using selected leaves (n = 10×3) of the regrowth after the third cut. Leaf growth rate (LGR) decreased with time and was significantly higher at Fureneset than Vågønes. Photosynthetic acclimation before winter also differed at the two sites. A clear relationship between LGR and changes in photosynthetic apparatus was observed. In the south, relative light energy excess appeared to act as a signal triggering growth cessation, whereas in the north LGR was limited by the energy available for photosynthesis. Differing responses were also observed in northern- and southern-adapted meadow fescue cultivars. How do non-adaptive grasses control growth cessation during autumn in high-latitude regions?
|Publication size in sheets||0.3|
|Book||Helgadóttir Áslaug, Hopkins Alan (eds.): The Role of Grasslands in a Green Future. Threats and Perspectives in Less Favoured Areas. Proceedings of the 17th Symposium of the European Grassland Federation Akureyri, Iceland 23-26 June 2013, Grassland Science in Europe, vol. 18, 2013, European Grassland Federation, ISBN 978-9979-881-20-9, 581 p.|
|Keywords in English||growth cessation, photosynthetic activity, leaf growth rate, perennial ryegrass, xFestulolium|
|Finansowanie||Norwegia, VarClim project|
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