Thermal acclimation of both An and Rdvaries widely among tree species depending on their thermal environment (Aitken et al., 2008; Dillaway and Kruger, 2010; Way and Yamori, 2014; Reich et al., 2016). Thermal acclimation of An can improve or at least maintain plant photosynthetic performance when the growth temperature regime shifts from cold to warm through adjustments of one or more photosynthetic components (Way and Yamori, 2014). This may occur via (1) the shift in the thermal optimum of An (Topt) towards the warm growing temperature, (2) the increase or maintenance of the photosynthetic rate at Topt (Aopt) in the new growing temperature conditions, (3) the shift in both Aopt and Topt (Way and Yamori, 2014), or (4) the increase or maintenance of the photosynthetic rate with respect to growth temperature (Agrowth). The mechanisms involved in thermal acclimation of photosynthesis include adjustment in (1) thermal responses of both maximum rate of carboxylation (Vcmax) and maximum electron transport rate (Jmax) (activation and deactivation energy), (2) basal Vcmax measured at a reference temperature of 25 °C (Vcmax25) and Jmax25, (3) the ratio of Jmax25 to Vcmax25, and (4) thermal responses of mesophyll (gm) and stomatal conductance (gs) (Kattge and Knorr, 2007; Warren, 2008; Silim et al., 2010; Way and Yamori, 2014).