Figure 1.

Effect of high temperature (40°C) on growth (A) and medium pH (B) of maize coleoptile segments incubated in the presence of IAA (10 µM) and FC (1 µM). The growth of a stack of 21 segments, expressed as elongation (µm cm⁻¹), was measured simultaneously with medium pH at 40°C. After preincubation (over 2 h) of the coleoptile segments in control medium, IAA and FC was added (arrow). Values are means of 11 independent experiments. Bars indicate ± SE. In the case of medium pH SE did not exceed 8%.