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Contents of trans-zeatin (tZ) (1) and of tZ riboside (tZR) (2) in fine roots (A), young leaves (B), and mature leaves (C) of poplars treated with sulphur depletion and of control plants (day 0). Data presented are the means ±SD of five replicates where each replicate consisted of two pooled plants. Lower case letters indicate significant differences at P < 0.05 between different time points within one tissue. dw, dry weight
