FIGURE 3.

Changes in contents of (A) Na⁺, (B) K⁺, and (C) Na⁺/K⁺ ratios in roots, stems and leaves of the empty vector-transformed and PgTIP1-transformed soybean hairy root composite plants under salt stress. The seedlings with hairy roots of a similar-length were selected and treated with ½ Hoagland solution containing 120 mM NaCl for 5 days, and seedlings grown in ½ Hoagland solution without NaCl served as the untreated control. During this period, the solutions listed above were replaced once. The sampled leaves included the 1st pair of unifoliolate, the 1st and 2nd trifoliate leaves. Each bar represents the mean and SD of three replicates, means in bars followed by different letters show significant difference (P < 0.05) between the parameters of the empty vector-transformed and PgTIP1-transfromed soybean hairy root composite plants.