Figure 3.

NaCl stress-triggered growth inhibition of seedling roots was alleviated by exogenous melatonin and sodium nitroprusside (SNP; a NO-releasing compound). Three-day-old rapeseed seedlings were pretreated with the indicated concentrations of melatonin or 10 μM SNP for 12 h, and then transferred to 200 mM NaCl for another 2 days. Afterwards, the root elongation (A) and root fresh weight (B) were measured. The sample without chemicals was the control (Con). Values are means ± SE of three independent experiments, with at least three replicates for each. Bars with different letters are significant different at p < 0.05 according to Duncan’s multiple range test.