Fig. 1.

Effects of GA and auxin on adventitious rooting of tobacco stem cuttings. (a) Average adventitious root number of WT plants grown in vitro on media with different treatments for 3 weeks. (b) Average length of the three longest primary roots of WT plants grown in vitro on media with different treatments for 3 weeks. Bars show the means and standard error over three events (at least 10 ramets per event). * and ** indicate significance as determined by Student’s t-test at P < 0.05 and P < 0.01, respectively. (c) Roots of differently treated plants. The length of the sides of the square grids is 0.5 inches.