Performance of soybean plants with cotransgenic hairy roots in response to salt stress. A, Performance of the aerial part of soybean plants after salt stress. Soybean seedlings with K599, G6-OE, and G6-OE + LHP1-1-OE transgenic hairy roots were treated with 120 mm NaCl for 3 d. Plants in water were used as control. B, Enlargement of the parts indicated in right panel of (A) to show the performance of soybean leaves after salt stress. C, Relative electrolyte leakage in leaves of soybean with transgenic hairy roots. Bars indicate sd (n = 10). Asterisks indicate significant difference (**P < 0.01) compared to leaves of control plants (K599). D, Expression level of GmPHD6 and LHP1-1 genes in transgenic hairy roots. E, Performance of the aerial part of soybean plants after salt stress. Soybean seedlings with G6-OE and LHP1-RNAi transgenic hairy roots were treated with 100 mm NaCl for 3 d. Plants in water were used as control. F, Enlargement of the parts indicated in right panel of (E) to show the performance of soybean leaves after salt stress. G, Relative electrolyte leakage in leaves of soybean with transgenic hairy roots. Bars indicate sd (n = 10). Asterisks indicate significant difference (**P < 0.01) compared to leaves of control plants (K599). H, Expression level of GmPHD6, LHP1-1, and LHP1-2 genes in transgenic hairy roots.