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(A) Adventitious root formation in apple stem cuttings after 18 days in rooting medium (control) or rooting medium supplemented with DPI (5 μM, 10 μM, and 20 μM). Percent rooting (B) and adventitious root number per cutting (C) were counted at 18 days. Bars indicate mean and Standard Deviation (SD) of three biological replicates; n = 6 individuals per replicate.
