Abstract
Water-stressed and well-watered soybean ( Glycine max cvs. Williams and Corsoy) plants were exposed to increasing seasonal doses of ozone (O 3) using open-top field chambers and ambient air plots. Chamber O 3 treatments included charcoal filtered (CF) air, non-filtered (NF) air, NF + 0·03, NF + 0·06 and NF + 0·09 μl litre −1 O 3. Soil water potentials measured at 25 and 45 cm averaged −0·40 MPa and −0·05 MPa, respectively, for the plots in the water-stressed and well-watered series. Total root length/core, root length densities, and biomasses (dry weights) were determined. With Williams, a very popular cultivar in recent years, total root length for all O 3 treatments averaged 58% more under water-stress conditions than in well-watered plots, but the range was from 136% to 11% more for NF air and NF + 0·09 μl litre −1 O 3, respectively. Increasing the O 3 exposure dose did not affect root lengths or weights in the well-watered series. With Corsoy, water stress did not significantly increase root development. In both soil moisture regimes, with both cultivars, there was a linear decrease in seed yield and top dry weight as the O 3 exposure dose increased.
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