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proNPF2.4-driven GUS activity in roots is reduced by salt treatments. Two-week-old T2 proNPF2.4:UidA plants were GUS stained for 1 h after salt treatments as indicated for 5 d. Roots were subjected to MUG assay. Absorbance measured using a spectrophotometer at 366 mm to measure MUG concentrations. Error bars represent mean ± se (n = 3). Significance is indicated by the asterisks (one-way ANOVA and Tukey test, *P ≤ 0.05 and **P ≤ 0.01).
