Figure 3.

Growth rates of the roots of intact cucumber seedlings treated with IAA and/or OGA. The roots of ten 2-d-old cucumber seedlings were bathed in 18 mL of incubation medium in hydroponic growth chambers. Each point represents the mean ± se of the growth rate measured at 90′ intervals in at least four separate experiments. The growth rate at time zero represents the average growth rate measured over the preceding 3 h. A, Growth rate of roots treated with 1 μm IAA (▪; n = 6), 0.2 μm IAA (▴; n = 4), and untreated roots (●; n = 6). B, Growth rate of roots treated with 50 μg mL⁻¹ OGA pool at −60 min followed by addition at 0 min of 1 μm IAA (▪; n = 6), 0.2 μm IAA (▴; n = 4), or no additional treatment (●; n = 4).