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Time course of superoxide dismutase activity during accelerated aging treatment for 90 days. The accelerated aging treatment was the same as for Figure 5. * Different small letters in a same date (for vertical comparison) indicate significant difference of means at α = 0.05 by t-test. ** Different capital letters in a same variety (for horizontal comparison) indicate significant difference of means at α = 0.05 by Duncan’s Multiple Range Test.
