Fig. 3

Effect of the repeated application of ATP (0.1—5 mM) on the growth of WT seedlings. a Leaf area. b Root length. c Fresh weight. d Dry weight. The first application of ATP was performed at 21th day of the growth, indicated by the red line. Control: the WT seedlings without ATP treatment, and ATP: the WT seedlings repeatedly treated with ATP. The values represent means ± SD from twenty independent seedlings. For Fig. 3a, different letters on top of the bars indicate significant differences (P < 0 .05) among the different treatments at the same time. For Fig. 3b-d, the means denoted by the same letter did not significantly differ at P < 0.05 among the different treatment