Fig. 1

Effect of MH on the growth of S. polyrrhiza 7498. Six groups of duckweed plants (total 24 fronds) were inoculated into the flasks with different medium, respectively. On the 8th day of experiment, photos (a) were taken, and frond numbers (b) were accounted. Fresh and dry weight (c, d) were measured every 2 days. In a a to f show plants incubated in 0 µg/mL, 25 µg/mL, 50 µg/mL, 75 µg/mL, 100 µg/mL and 200 µg/mL MH, respectively. * indicates statistically significance on the level of P < 0.05; and ** indicates statistically significance on the level of P < 0.01, in comparison with the control (0 µg/mL). Each point in b–d represents mean ± SE of 3 biological replicates