Fig. 8

AR numbers during hydroponic culture of poplar cuttings with different concentrations of supplemented H₂O₂. There were 15 plants for 1000 μM H₂O₂treatment; while 30 plants for all other treatments. AR number was presented by mean value of each treatment. The multiple comparisons was performed under the significant level ofPvalue equal to 0.05. The error bar represents standard deviation for each treatment