Data för: Fridell et al. - Photoperiod does not affect thermal acclimation of shoot-scale gas exchange but is important for shoot development in cuttings of Norway spruce (Picea abies (L.) H. Karst) Data for: Fridell et al. - Photoperiod does not affect thermal acclimation of shoot-scale gas exchange but is important for shoot development in cuttings of Norway spruce (Picea abies (L.) H. Karst) 2025-218-1 https://doi.org/10.5878/pjgb-yy92 Swedish National Data Service Svensk nationell datatjänst Landing page Data för: Fridell et al. - Photoperiod does not affect thermal acclimation of shoot-scale gas exchange but is important for shoot development in cuttings of Norway spruce (Picea abies (L.) H. Karst) Data for: Fridell et al. - Photoperiod does not affect thermal acclimation of shoot-scale gas exchange but is important for shoot development in cuttings of Norway spruce (Picea abies (L.) H. Karst) 2025-218-1 https://doi.org/10.5878/pjgb-yy92 10.1093/treephys/tpaf112 Fridell, Astrid Fridell, Astrid Wallin, Göran Wallin, Göran Almqvist, Curt Almqvist, Curt Tarvainen, Lasse Tarvainen, Lasse 2019-02507_Formas 2019-02507_Formas Swedish National Data Service Svensk nationell datatjänst Landing page global warming global uppvärmning air temperature lufttemperatur tree growth photosynthesis fotosyntes bud burst day length dagslängd Norway spruce gran (art) The data set contains measurement data collected during a factorial day length x warming experiment on Norway spruce (Picea abies (L.) H. Karst) cuttings of two geographical origins. The cuttings were exposed to combinations of long (20 hours of daylight) or short (14 hours of daylight) days and warm (25/20 °C day/night) and cool (15/10 °C day/night) growing conditions for three months in growth chambers. Collected data include gas exchange variables measured using a Li-Cor 6400 portable photosynthesis system for determination of light response curves and photosynthetic responses to differing intercellular CO2 concentrations (A-Ci curves). Needle properties including leaf mass per area and nitrogen content were determined. In addition, the height growth of the cuttings and the rate of bud development was observed under the different treatment conditions. The data set is divided into five files: 1) Definitions of the variables names and units used in the data files 2) Gas exchange data for generating light response curves 3) Gas exchange data for generating A-Ci curves 4) Needle property data, which also includes data on tree origin 5) Height growth and bud development data Sweden Sverige Numeric Access to data through SND. Data are freely accessible. Åtkomst till data via SND. Data är fritt tillgängliga. openAccess Astrid Fridell, Göran Wallin, Curt Almqvist, Lasse Tarvainen, Photoperiod does not affect thermal acclimation of shoot-scale gas exchange but is important for shoot development in cuttings of Norway spruce (Picea abies (L.) H. Karst), Tree Physiology, 2025;, tpaf112, https://doi.org/10.1093/treephys/tpaf112 Astrid Fridell, Göran Wallin, Curt Almqvist, Lasse Tarvainen, Photoperiod does not affect thermal acclimation of shoot-scale gas exchange but is important for shoot development in cuttings of Norway spruce (Picea abies (L.) H. Karst), Tree Physiology, 2025;, tpaf112, https://doi.org/10.1093/treephys/tpaf112 10.1093/treephys/tpaf112 2025