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Incorporation of radioactivity from l-[U-14C]Orn into free putrescine (A), spermidine (B), and spermine (C) in a non-transgenic (NT) and a transgenic (2E) cell line of poplar at different times of incubation. Three-day-old cells (approximately 1 g in 10 mL) were incubated with 0.2 μCi of l-[U-14C]Orn for various time periods. Each bar represents mean ± se of two replicates. An asterisk indicates that values for 2E are significantly different (P ≤ 0.05) from NT cells at a given time.
