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The effect of CA, NaHS, PAG, and HT on root elongation in tobacco seedlings under Cd stress. The roots of seedlings were treated with distilled water (control), CdCl2 (20 μM), CA (20 μM), NaHS (20 μM), PAG (2 μM), HT (20 μM), alone or their combinations for 72 h, for the measurement of root length. Different letters indicated that the mean values of five replicates were significantly different between the treatments (p < 0.05, ANOVA, LSD).
