DYNAMICS OF CO2 EVOLUTION BY PLANTS AT LOW-PRESSURE

Dynamics of CO2 evolution at low pressure was studied in barley, maize , pea, wheat and pine seedlings using the gas exchange system with las er photoacoustic spectrometer. The CO2 evolution from plant surfaces t o environment increased with decreasing air pressure. Simultaneously t he changes in activities of phosphoenolpyruvate carboxylase, glucose-6 -phosphate dehydrogenase, glyceraldehyde phosphate dehydrogenase, alco hol-dehydrogenase, isocitrate dehydrogenase, malate dehydrogenase in p ea and maize leaves were observed. The response depended on plant spec ies used as well as on air pressure and period of its action.