Fig. 1

Effect of exogenous 2,4-epibrassinolide (EBL) and methane-rich water (MRW) on AR development in marigold explants. The primary roots of 5-day-old seedlings were removed, and then each of 10 marigold explants was incubated with different concentrations of EBL (0, 0.05, 0.1, 0.5, 1, 5 μmol L^− 1) and MRW (0, 5, 10, 20, 50, 100%) for 5 days. Values (mean ± SE) of root number and root length (A, C) of marigold explants are the means of three independent experiments (n = 30). Bars with different lowercase letters are significantly different (Duncan’s multiple range test; p < 0.05). Photographs (B, D) were taken after 5 days of treatments