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Endogenous IAA concentration (picogram per milligram fresh weight) of different parts of the third oldest petiole of R. palustris (27-d-old). A and B, Whole petiole of intact or debladed leaves (leaf blade removed at t = 0 h). C to F, Ab- and adaxial fragments of the base and the remaining apical part, cut as shown in the insert in Figure 1 (dashed lines). Data are means of four to eight replicate plants (bars represent ses).
