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Effect of N-acetylcysteine (NAC) on the length of the embryonic axis during soybean seed germination. Seeds were treated with distilled water (control), 25 mm N-acetylcysteine (NAC), 25 mm NAC + 300 p.p.m. ethephon, or 25 mm NAC + 100 mm H2O2 for 24 h. Bars with different letters differ significantly (P < 0·01, Tukey's test, n = 10).
