Journal
JOURNAL OF EXPERIMENTAL BOTANY
Volume 57, Issue 2, Pages 291-302Publisher
OXFORD UNIV PRESS
DOI: 10.1093/jxb/erj049
Keywords
activation energy; gas exchange; limitation; limiting step; model; nitrogen use; optimal temperature; photosynthetic acclimation; temperature response
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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 (V-c max), activation energy of the rate of RuBP regeneration (J(max)), and the ratio of J(max) to V-c max. In the survey, every species increased the activation energy of V-c max with increasing growth temperature. Other factors changed with growth temperature, but their responses were different among species. Among these factors, activation energy of V-c 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.
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