Abstract
The atmospheric CO2 level has been increasing and is predicted to double by the end of this century. The elevation of atmospheric CO2 level might lead to promotion of photosynthesis, which is directly associated with improvement of crop yields and better production of useful material including biofuel. However, the elevation of the atmospheric CO2 level does not always promotes photosynthesis but represses both photosynthesis and nitrogen assimilation in some plant species. Previously, we reported that enhancement of nitrogen and sulfur assimilation in transgenic Arabidopsis expressing the Dof1 transcription factor facilitates activation of carbon fixation under the growth condition where ammonium ions and light energy are abundantly supplied. Here we investigate the effects of atmospheric CO2 enrichment on the nitrogen and sulfur assimilation and carbon fixation in the Dof1 transgenic Arabidopsis plants by target metabolome analysis and discuss about the effects of genetic enhancement of nitrogen assimilation on plant response to elevation of atmospheric CO2 level.
