Changes in the photosynthetic performance, the activity of enzymes of nitrogen metabolism, and proline content in the leaves of wheat plants after exposure to low CO<sub>2</sub> concentration

The changes in photosynthetic activity, as well the activity of nitrogen-metabolism enzymes, intensity lipid peroxidation, and proline content were studied Triticum aestivum L. plants after their incubation at a low CO2 concentration sealed chamber for 10 d. deficiency (-CO2) compared to normal (control) led decrease rate O2 gas exchange plateau light curve quantum yield photosynthesis. maximum effective photochemical yields also decreased. reduced nitrate reductase, but increased activities nitrite glutamine synthetase, glutamate dehydrogenase, promoted accumulation. It is assumed that with lack CO2, an excess nitrogen-containing compounds occurs, which must be removed from metabolic processes. Also, we suggest partial storage nitrogen form such proline.