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Relative RpEXPA1 expression level in ab- and adaxial halves of the base of the third oldest petiole of R. palustris plants (27-d-old; five replicate plants). 18S was used as an internal standard and values are expressed as a ratio to the value of RpEXPA1 at t = 0 for the basal abaxial segment (set to 1). The petiole base was cut as shown in the insert in Figure 1 (solid line). Bars represent ses.
