The Influence of Soil Moisture on Macroscopic Sulfur Dioxide Injury to Pinto Bean Foliage

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Abstract
The influence of soil moisture stress on SO2 injury to pinto bean foliage was investigated in relation to stomatal conductance rate, soil moisture content and plant water potential. Pinto bean plants were grown at 4 soil water potentials (-1/3, -1, -3 and -5 atm) and exposed to 5720 .mu.g/m3 (2.2 ppm) SO2 for 3 h. Macroscopic injury was severe on plants grown at -3 and -5 atm water potential. Injury was highly correlated with percentage of soil moisture, and both injury and soil moisture were highly correlated with the stomatal conductance rate and water potential of the plants. The duration of soil moisture stress (1, 2 or 3 days) did not affect the amount of macroscopic injury induced by SO2, the stomatal conductance rate, or plant water potential. Stomatal conductance rates of plants grown at -1/3 and -1 atm soil water potential decreased when the plants were exposed to SO2, while those of plants grown at -3 and -5 atm soil water potential were not affected by exposure to SO2.

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