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Malate (a) and citrate (b) concentrations in root tips of E. grandis × E. urophylla G9 and E. urophylla W4 after 24 h treatment with aluminium in the absence or presence of the anion channel inhibitor phenylglyoxyl (PG) or the protein synthesis inhibitor cycloheximide (CHM). Bars represent means ± standard errors (n = 3). Different letters above the bars indicate significant differences at P < 0.05. CK, non-Al-treated control
