Clinal variation in growth and other functional traits as a result of local genetic adaptation to climate of origin has been reported for several boreal tree species (Li et al., 1997; Andalo et al., 2005; Aitken et al., 2008; Benomar et al., 2016). However, little evidence exists regarding the genetic differentiation in the thermal acclimation capacity and its involvement in growth clinal variation. Recently, Drake et al. (2017) found similar thermal responses (both An and Rd) in response to an experimental warming (under controlled conditions) of three seed sources of Eucalyptus tereticornis despite a large geographical distance among them and a 13 °C difference in mean annual temperature at seed origin. Similar results were reported for Pinus banksiana (Tjoelker et al., 2009). In contrast, Ishikawa et al. (2007) showed intraspecific variation in thermal acclimation of An among Plantago asiatica populations, which was related to the capacity of adjustement of the Jmax25 to Vcmax25 ratio.