In ordinary crops, however, nitrogen correlation involving RuBP carboxyla- tion and regeneration procedures doesn’t appear to be influenced by CO2 concentrations where crops have been grown (Medlyn et al. 1999). Recent research, however, have discovered that expansion temperature affects the equilibrium between RuBPCase and also the RuBP regeneration procedure. Hikosaka et al. (1999) revealed that Quercus myrsinaefolia leaves grown in a very low temperature had a greater ratio of RuBP regeneration capacity (expressed as the maximum elec- tron transfer speed, Jmax) into carboxylation capacity (Vcmax) than those grown at a higher temperature, and therefore photosynthesis was sensitive to CO2 in plants acclimated to low temperatures.
A similar tendency was discovered by Wilson et al. (2000), who reported that fall leaves had a greater ratio of Jmax/Vcmax than summertime leaves in many deciduous tree species in temperate woods. We tested the hypothesis that seasonal fluctuations in air temperature affect the equilibrium and regulate the CO2 reaction of photosynthesis (Onoda et al. 2005). Vcmax and Jmax were decided in summer and fall for leaves of Polygonum cuspidatum grown in two CO2 concentrations. The raised CO2 conscentration decreased both Vcmax and Jmax without altering the Jmax/Vcmax ratio.