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Wild type tobacco N. tabacum var. John William’s Broadleaf and the tobacco aurea mutant Su/su were permanently grown under 700 ppm CO 2  in air. In comparison to plants grown under 350 ppm CO 2  in air but under otherwise identical conditions growth was substantially enhanced. Gas exchange measurements carried out by mass spectrometry show that the rate of photosynthesis in the wild type and in the mutant is increased by more than 100%. The photorespiratory rate in the wild type measured as  18 O 2 -uptake in the light in the “700 ppm CO 2 -plants” is not reduced to the extent expected or deduced from experiments in which the 350 ppm system responds under in vitro conditions to 700 ppm CO 2 . An analysis of the induction kinetics of room temperature fluorescence kinetics of the adapted (700 ppm CO 2 ) system and the control system (350 ppm CO 2 ) under various CO 2 -partial pressures shows that permanent growth under the elevated CO 2 -partial pressure leads to a structural modification of the photosynthetic apparatus.

Consequences of High CO 2 -Concentrations in Air on Growth and Gas-Exchange Rates in Tobacco Mutants