Fig. 3

Effect of electric field (±15 V/15 min) on IAA-induced elongation growth (µm/segment) of maize coleoptile segments (A) and simultaneously with growth measured medium pH (B). A⁺and A^- mean the positive and negative polarization of the segment’s apical part, respectively. After excision, the coleoptile segments were preincubated (within 1 h) in the control medium, whereupon they were placed in the setup (Scheme 3) used for electric stimulation. After electric treatment, the coleoptile segments were arranged in an apparatus, which allowed simultaneous measurements of the elongation growth and pH of the incubation medium (see Methods). Data (mean ± S. E.) are means of at least eight independent experiments