Fig. 1.

Effects of 1 mm (A) and 10 mm (B) KCl or KNO₃ on the growth rate of maize coleoptile segments incubated in the presence or absence of 10 μm IAA. The growth rate of a stack of five segments was measured as described in Materials and methods (first measuring system). IAA was added to the incubation medium at 2 h. Inset shows total elongation growth calculated as the sum of extensions measured at 3-min intervals for 10 h. All curves represent means of at least nine independent experiments. Bars indicate ± s.e. The LSD test is included in Supplementary Data Fig. S2.