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Published on October 30, 2009; 10.1104/pp.109.145862

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Received August 6, 2009
Accepted October 27, 2009

Phenotypic plasticity in photosynthetic temperature acclimation among crop species with different cold tolerances

Wataru Yamori *, Ko Noguchi , Kouki Hikosaka , and Ichiro Terashima

Department of Biology, Graduate School of Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka, 560-0043, Japan; Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan; Graduate School of Life Sciences, Tohoku University, Aoba, Sendai, 980-8578, Japan

* Corresponding author; email: wataru.yamori{at}biochem.tohoku.ac.jp.

While interspecific variation in the temperature response of photosynthesis is well documented, the underlying physiological mechanisms remain unknown. Moreover, mechanisms related to species-dependent differences in photosynthetic temperature acclimation are unclear. We compared photosynthetic temperature acclimation in 11 crop species differing in their cold tolerance, which were grown at 15°C or 30°C. Cold tolerant species exhibited a large decrease in optimum temperature for the photosynthetic rate at 360 μL L-1 CO2 concentrations (Opt (A360 )) when growth temperature decreased from 30°C to 15°C, whereas cold sensitive species were less plastic in Opt (A360 ). Analysis using the C3 photosynthesis model shows that the limiting step of A360 at the optimum temperature differed between cold tolerant and cold sensitive species; RuBP carboxylation rate was limiting in cold tolerant species, while RuBP regeneration rate was limiting in cold sensitive species. Alterations in parameters related to photosynthetic temperature acclimation, including the limiting step of A360 , leaf nitrogen and Rubisco contents, were more plastic to growth temperature in cold tolerant species than cold sensitive species. These plastic alterations contributed to the noted growth temperature dependant changes in Opt (A360 ) in cold tolerant species. Consequently, cold tolerant species were able to maintain high A360 at their growth temperature at 15°C or 30°C, whereas cold sensitive species were not. We conclude that differences in the plasticity of photosynthetic parameters with respect to growth temperature were responsible for the noted interspecific differences in photosynthetic temperature acclimation between cold tolerant and cold sensitive species.






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