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Effect of 2 μM NaHS on Al contents in root apices (A), root cell wall (B) and the Al deposited at the root surface (C). The root tips (0–1 cm) were stained with 0.1% eriochrome cyanine R (v/w) and the pink color on the root surface indicates Al accumulation (as the red arrows point out). Data are means ± SD (n = 4). Columns with different letters are significantly different at P < 0.05.
