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JXB Advance Access published online on December 19, 2005
Journal of Experimental Botany, doi:10.1093/jxb/erj049
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© The Author [2005]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org
Received June 19, 2005
Accepted November 10, 2005

PHENOTYPIC PLASTICITY AND THE CHANGING ENVIRONMENT SPECIAL ISSUE ARTICLE

Temperature acclimation of photosynthesis: mechanisms involved in the changes in temperature dependence of photosynthetic rate

Kouki Hikosaka 1 *, Kazumasa Ishikawa 1, Almaz Borjigidai 1, Onno Muller 1, and Yusuke Onoda 2

1 Graduate School of Life Sciences, Tohoku University, Sendai 980-8578, Japan
2 Graduate School of Life Sciences, Tohoku University, Sendai 980-8578, Japan; Present address: Department of Plant Ecology, Utrecht University, PO Box 80084, 3508 TB Utrecht, The Netherlands

* To whom correspondence should be addressed.
Kouki Hikosaka, E-mail: hikosaka{at}mail.tains.tohoku.ac.jp


  Abstract

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 photosynthesis-temperature curve are discussed. Based on the biochemical model of photosynthesis, change in the photosynthesis-temperature 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.

Keywords: Activation energy; gas exchange; limitation; limiting step; model; nitrogen use; optimal temperature; photosynthetic acclimation; temperature response.
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