Fig. 1
The content of the endogenous H2S in tobacco treated with 0.0, 2.0, 4.0, 6.0, and 8.0 mM of NaHS for 1, 12, 24, and 48 h, respectively. The results are the mean of three replicates, and the error bars show the standard deviation (SD). Different letters in lowercase denote significant differences between treatment groups at the 5% level, according to Duncan’s test