The Impact of Ozone on Peanut Exposed in the Laboratory and Field

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Abstract
Laboratory studies and observations for 2 yr in the field demonstrated that ambient levels of O3 have the potential to injure peanut (A. hypogaea) crops. Assessment of O3 injury following exposure in the laboratory showed that the Spanish-type ''USDA PI 268661'' peanut was more sensitive than the Valencia-type ''McRan'' peanut. The antioxidant, EDU (ethylene diurea), reduced foliar injury on USDA PI 268661 in both the laboratory and field. EDU protected ''McRan'' from injury in laboratory exposures. Little or no injury was observed on ''McRan'' peanut grown in the field, and EDU treatment had no effect on yield. High levels of foliar injury on USDA PI 268661 were associated with significant reductions in yield, reduced N fixation and increased leaf drop.