Balancing carboxylation and regeneration of ribulose‐1,5‐ bisphosphate in leaf photosynthesis: temperature acclimation of an evergreen tree, Quercus myrsinaefolia

摘要: Changes in the temperature dependence of photosynthetic rate depending on growth were investigated for a temperate evergreen tree, Quercus myrsinaefolia. Plants grown at 250 μmol quanta m–2 s–1 under two conditions, 15 and 30 °C. The optimal that maximizes light-saturated photosynthesis 350 μL L–1 CO2 was found to be 20–25 30–35 °C leaves °C, respectively. We focused processes, carboxylation regeneration ribulose-1,5-bisphosphate (RuBP), which potentially limit rates. Because former process is known lower concentrations while latter limits it higher concentrations, we determined 200 1000 saturated light. It revealed both processes varied temperature. Using biochemical model, estimated capacity various temperatures ambient concentration. suggested that, low (15 °C), limited solely by RuBP any On other hand, high (30 below 22 but above concluded that: (1) changes (2) balance these altered rate.