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Catalase gene expression was characterized in the scutellum of maize seedlings grown at normal (25 o C) and elevated temperatures (35 and 40 o C). Chronic elevated temperatures reduce scutellar catalase activity most noticeably in the inbred lines W64A and R6-67, which express all three CAT isozymes (CAT-1, CAT-2, and CAT-3). The observed decline in catalase activity is primarily attributed...