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The effect of Al stress on oxalate content in wild-type and overexpression tobacco lines. The plants of wild-type and two independent transgenic lines were exposed to 1:30 strength Hoagland nutrient solution with 0 (−Al) or 4 µm Al (+Al) for 24 h. After treatment, root tips were homogenized thoroughly in deionized water for oxalate content analysis. Data are means ± sd (n = 3). Asterisk indicates significant differences between treatments at P < 0.05.
