Figure 1.

Effect of Al application (90 μm Al_mono in 0.6% [w/v] agarose gel) for 1 h to the entire root apex or to specific 1-mm root segments on the root elongation rate of primary roots of the maize cv ATP-Y (Al-resistant) and cv Lixis (Al-sensitive). Values are means of five independent replicates ± sd. The results shown are representative of three independent experiments. Different letters indicate significant differences at P < 0.05 (Tukey's test). White bars, 0 μm Al; black bars, 90 μm Al.