Acid soil [aluminum (Al)] toxicity and ozone toxicity are potential yield-limiting factors for soybeans [Glycine mau (L.) Merr.]. Previous studies in our laboratory suggested that tolerance to these two stress factors coincided in some soybean cultivars. The objective of the current study was to determine the relationship between acid soil (Al) tolerance and ozone (O3) tolerance in a range of soybean cultivars. Seventeen cultivars, known to differ in Al tolerance, were screened for O3 tolerance, some in a fumigation chamber and some in O3 polluted, unfiltered air in a greenhouse. In spite of variability encountered, we concluded that Ferry, Santa Rosa, Davis, Biloxi, Bossier, Lee, VNIIS-2, and Essex soybean cultivars were more tolerant to O3 than Forrest, Aurora, Smena, Brunatna, Yantarnaya, and Chief. Some cultivars showing high tolerance to O3 (St. 59, Giessener, Biloxi, Bossier, Lee, and Ferry) were also acid soil (Al) tolerant, but two Al-tolerant cultivars (Aurora and Brunatna) were O3 Sensitive. Other cultivars (Chief, Salute 216, and Smena) were sensitive to both Al and O3. Manganese (Mn)-tolerant Lee soybean was more tolerant to O3 than Mn-sensitive Forrest. Because both O3 toxicity and Mn toxicity are regarded as oxidative stresses, this finding has implications for future studies on oxidative stress tolerance mechanisms in plants.
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