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Expression levels of ALS3, MATE, and ACT9 in different aspen tissues. Expression levels of ALS3 (A), MATE (B), and ACT9 (C) in root, stem, and leaf tissue of plants treated with no or 500 μM Al for 2 d. Transcript levels were quantified by absolute qRT-PCR. The means and standard error values from three independent samples are shown. Different letters indicate significant differences between treatments and tissues (ANOVA; p < 0.05).
