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The effects of 100 μm MSX on cellular putrescine (A and D), spermidine (B and E), and spermine (C and F) levels in 3-d-old non-transgenic (NT) and transgenic (2E) cells of poplar and its reversal by Orn (A–C) or Arg (D–F). Treatments were given for 72 h. Each bar represents mean ± se of four replicates. Different letters above the bars indicate that values are significantly different (P ≤ 0.05) from each other for the same cell line.
