Figure 4.

Effect of exogenous hormones on plant and inflorescence architecture under short-day photoperiod. Shoot apex of cannabis plants 13 (A–D), 28 (E–H), and 33 (I–L) days after plant growth regulator application. A, E, I, Control, (B, F, J) 4.5 ppm of synthetic auxin 2,4-D, (C, G, K) 100 ppm gibberellic acid GA₄, (D, H, L) 100 ppm GA₄ + 4.5 ppm 2,4-D. Bar = 2 mm for (A–H), and 2 cm for (I–L). M, Stem length and (N) internode length 42 days after hormone application. Significant differences between each treatment and the control (C) were determined by one-way ANOVA, Dunnet’s test, ^*P ≤ 0.05. Presented data are averages ± SE (n = 3–4 for M; n = 15–20 for N).