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Acclimation of photosynthesis to temperature in Arabidopsis thaliana and Brassica oleracea
- 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 (g'm). 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 g'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 VCmax, Jmax, and g'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.
Bunce, J. A.
Arabidopsis thaliana , Brassica oleracea var. viridis , collard greens , leaf development , photosynthesis , acclimation , gas exchange , chlorophyll , mesophyll , electron transport chain , carbon dioxide , ambient temperature , carboxylation
- Includes references
- Photosynthetica 2008 Dec., v. 46, no. 4
- Dordrecht : Springer Netherlands
Journal Articles, USDA Authors, Peer-Reviewed
- Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.