Fig. 6From: Effect of hydrogen sulfide (H2S) on the growth and development of tobacco seedlings in absence of stressThe effects of 0.0, 2.0, 4.0, 6.0, and 8.0 mM NaHS on the activity of tobacco roots after 15 days. Bars represent the mean ± SE. Different letters in lowercase denote significant differences between treatment groups at the 5% level, according to Duncan’s testBack to article page