Abstract
Growth chamber experiments were conducted to determine the influence of the air pollutant ozone (O 3) [0.2 and 0.3 ppm (v/v)] on the growth of corn ( Zea mays L.) treated with the herbicide atrazine (2.5 and 3.5 kg/ha) and the antioxidant propyl gallate (5 and 8 kg/ha). At both concentrations O 3 at 0.3 ppm alone reduced dry weights of corn and chlorophyll. Chlorophyll a was more affected than chlorophyll b by O 3 at 0.3 ppm alone and in combination with atrazine. Propyl gallate at both rates protected corn against O 3 injury. The interaction between atrazine and O 3 at 0.2 ppm was additive whereas at 0.3 ppm it was antagonistic. But combinations of atrazine and propyl gallate did not protect corn from O 3 injury.
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