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APX activity does not increase in SOR seedlings prior to or after stress. Seedlings were grown in 8 h of light and 16 h of dark for 10 d (zero time point) and then incubated at 45°C for 30, 60, or 120 min. Seedlings were harvested from before treatment (zero time point) and after heat treatment. APX activity was measured. Numbers are means of three values from two experiments. WT, Wild type.
