Abstract
Experiments were made in an attempt to determine the effect of ozone fumigation on the rate of CO2 exchange both in the light (24 klux) and in the dark of detached poplar leaves. The rate of CO2 exchange was determined before and after the exposure to 0.9 ppm ozone at 25°C with the air flow rate of 1.5 liter min-1.
Both net photosynthesis and CO2 evolution in the light were considerably decreased. However, dark respiration was increased after the ozone fumigation. The light and CO2 compensation points were significantly higher in the ozonated leaves. The results of these experiments are discussed.
