Abstract
Petunia at about 6 weeks old and kidney bean at two growing stages (6–7 days old and 16–18 days old) were exposed separately to O 3, (0–0.40 ppm) and PAN (0–0.25 ppm) for 4 h and to the mixture for the same time. In addition, petunia was exposed to O, (0.10–0.40 ppm) and then PAN (0.010−0.040 ppm) for 4 h, respectively. Foliar injury of petunia and kidney bean in exposures to the mixtures of O 3 and PAN was significantly smaller than that induced by each oxidant, with the exception of PAN injury on young leaves of 16–18 day-old kidney bean. The percentage of foliar injury caused by either of the mixed pollutants decreased with an increase of the concentration of the other oxidant, and was found to approximate a logarithmic function of the combined pollutant concentrations expressed as O 3, minum PAN or vice versa. Alternate exposures caused no additive or synergistic injuries.
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