Abstract
The atmosphere around plants in the field usually contains several phytotoxic air pollutant. How these pollutants interact and affect the expression of injury on plants are very important, but a clear explanation has not been made.
This paper summerized the Japanese and foreign literatures on the effects of combined pollutants on plants.
1) Acute effects
Tobacco plant exposed to combination of SO2 and O3 showed remarkably synergistic effect on injury expression, but on the other plant the general tendency of combined effect was not evident.
Examples of synergism of SO2 and NO2 on plant was reported by-Tingey et al.(1971), however, there were few reports which confirmed synergistic effect of these combination.
Combined treatment of O3 and PAN (Peroxyacetyl nitrate) on plant showed antagonistic effect of injury expressions in almost of all work.
2) Chronic effect
There were few reports which showed synergistic effect of SO2 and O3 on plant growth and yield.
Ashenden et al.(1978, 79) reported synergistic effect of SO2 and NO2 on grasses.
There were very few reports which showed synergistic effect of combined treatment of SO2 and HF.
