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 CO 2 concentration measured over the range of 10â€“35 Â°C for both species grown at 15, 21, and 27 Â°C were used to determine the T dependencies of maximum rates of carboxylation (V Cmax ), photosynthetic electron transport (J max ), triose phosphate utilization rate (TPU), and mesophyll conductance to carbon dioxide ( g â€™ m ). In A. thaliana , the optimum T of P N at air concentrations of CO 2 was unaffected by this range of growth T , and the T dependencies of V Cmax , J max , and g â€™ m 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 V Cmax , J max , and g â€™ m , 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 .
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