Abstract
Soybean (Glycine max L. cv. Buchanan) growing in top-covered chambers was exposed to a factorial combination of three concentrations of SO2 , (2, 99 and 189 nl1-1 ) and three concentrations of soil salinity with electrical conductivities of 0.7, 4.9 and 7.0 dS m-1 . Each combination was tested in duplicate chambers. SO2 exposure was for 4 h d-1 for 106 d from planting to final harvest. SO2 , increased leaf sulphur concentrations, while high salinity had the opposite effect. Stress interactions were observed late in the season, with leaf sulphur concentrations significantly decreased by simultaneous SO2 , and salinity stress when compared with exposure to SO2 , alone, SO2 or salinity stress both reduced leaf chlorophyll concentration, leaf area, plant dry weight and seed yields. Although SO2 -salinity interactions on the growth variables were not statistically significant, there were stress interactions on seed yield by affecting the number of pods produced. As SO2 -induced leaf injury developed is became more severe in the nonsaline plants than in the saline plants, indicating a protective function for salinity against SO2 injury. However, salinity-induced leaf injury occurred earlier and was more severe in the high SO2 and saline-treated plants than in the low SO2 and non-fumigated saline-treated plants.
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