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Acclimation of photosynthesis to increasing atmospheric carbon dioxide concentration ([CO 2 ]; 350 to 2000 μmol mol −1 ) was followed in silver birch ( Betula pendula  Roth.) and Scots pine ( Pinus sylvestris  L.) seedlings for two years. Chlorophyll fluorescence and concentrations of Rubisco, chlorophyll, total soluble protein and nitrogen were monitored together with steady-state gas exchange at three CO 2  concentrations (ambient [CO 2 ] (345 ± 20 μmol mol −1 ), the growth [CO 2 ] and 1950 ± 55 μmol mol −1 ).

Biochemical acclimation patterns of Betula pendula and Pinus sylvestris seedlings to elevated carbon dioxide concentrations