JXB Advance Access originally published online on December 19, 2005
Journal of Experimental Botany 2006 57(2):291-302; doi:10.1093/jxb/erj049
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RESEARCH PAPER |
Temperature acclimation of photosynthesis: mechanisms involved in the changes in temperature dependence of photosynthetic rate

Graduate School of Life Sciences, Tohoku University, Sendai 980-8578, Japan
* To whom correspondence should be addressed. E-mail: hikosaka{at}mail.tains.tohoku.ac.jp
Growth temperature alters temperature dependence of the photosynthetic rate (temperature acclimation). In many species, the optimal temperature that maximizes the photosynthetic rate increases with increasing growth temperature. In this minireview, mechanisms involved in changes in the photosynthesistemperature curve are discussed. Based on the biochemical model of photosynthesis, change in the photosynthesistemperature curve is attributable to four factors: intercellular CO2 concentration, activation energy of the maximum rate of RuBP (ribulose-1,5-bisphosphate) carboxylation (Vc max), activation energy of the rate of RuBP regeneration (Jmax), and the ratio of Jmax to Vc max. In the survey, every species increased the activation energy of Vc max with increasing growth temperature. Other factors changed with growth temperature, but their responses were different among species. Among these factors, activation energy of Vc max may be the most important for the shift of optimal temperature of photosynthesis at ambient CO2 concentrations. Physiological and biochemical causes for the change in these parameters are discussed.
Key words: Activation energy, gas exchange, limitation, limiting step, model, nitrogen use, optimal temperature, photosynthetic acclimation, temperature response
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