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Changes in transcript levels of four genes involved in nitrate uptake following nitrogen starvation. Changes in expression of (A) MdNRT1.1, (B) MdNRT2.5, (C) MdNIA1, and (D) MdNIA2 under nitrogen-starvation stress. Data are the means of three replicates with SEs. Different letters indicate significant differences between treatments, according to one-way ANOVA and Tukey’s multiple range test (P < 0.05).
