Fig. 1

a-e Melatonin and serotonin regulate RSA. a Five-day-old seedlings were transferred to 1/4 MS medium containing 10 or 50 μM melatonin or serotonin for 4 days. b PR elongation, c LRP numbers, d LR density, and e LRP numbers at were determined four developmental stages, as indicated. MT, melatonin; ST, serotonin. Error bars represent SE. Different letters indicate significantly different values (P < 0.05 by Tukey’s test)