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Al-induced callose formation in specific 1-mm segments of the primary root apex of the Al-sensitive maize cv Lixis (○) and the Al-resistant cv ATP-Y (●). Ninety micromolar Almono was applied for 1 h in agarose gel to specific 1-mm root zones, as indicated by arrows. Values are means of five independent replicates ± sd. The results shown are representative of three independent experiments. Stars indicate significant genotypical differences at P < 0.05 (Tukey's test).
