, Volume 46, Issue 4, pp 517-524
Date: 10 Dec 2008

Acclimation of photosynthesis to temperature in Arabidopsis thaliana and Brassica oleracea

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Abstract

Plants differ in how much the response of net photosynthetic rate (P N) to temperature (T) changes with the T during leaf development, and also in the biochemical basis of such changes in response. The amount of photosynthetic acclimation to T and the components of the photosynthetic system involved were compared in Arabidopsis thaliana and Brassica oleracea to determine how well A. thaliana might serve as a model organism to study the process of photosynthetic acclimation to T. Responses of single-leaf gas exchange and chlorophyll fluorescence to CO2 concentration measured over the range of 10–35 °C for both species grown at 15, 21, and 27 °C were used to determine the T dependencies of maximum rates of carboxylation (VCmax), photosynthetic electron transport (Jmax), triose phosphate utilization rate (TPU), and mesophyll conductance to carbon dioxide (gm). In A. thaliana, the optimum T of P N at air concentrations of CO2 was unaffected by this range of growth T, and the T dependencies of VCmax, Jmax, and gm were also unaffected by growth T. There was no evidence of TPU limitation of P N in this species over the range of measurement conditions. In contrast, the optimum T of P N increased with growth T in B. oleracea, and the T dependencies of VCmax, Jmax, and gm, as well as the T at which TPU limited P N all varied significantly with growth T. Thus B. oleracea had much a larger capacity to acclimate photosynthetically to moderate T than did A. thaliana.