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Variation in the content of ABA (A), auxins (B); IAA—indole-3-acetic acid, IBA—indole-3-butyric acid, 5-Cl-IAA—5-chloroindole-3-acetic acid, and salicylic acid (C) in the rhubarb buds during four months of the growth in the greenhouse after in vitro conditions. Means indicated with the same letter within each phytohormone and auxin type do not differ significantly (p = 0.05) according to Duncan’s test.
