Transcription profile of PeGRP2 in roots and shoots of P. euphratica under salt stress. Uniform seedlings of P. euphratica were treated with NaCl solution (0 or 100 mM) for 12 days. For RT-qPCR analysis, fine roots, shoots, and upper leaves (5th to 20th from shoot tip) were collected at day 1 (0 h, 3 h, 6 h, 12 h, 24 h), day 4, day 7, and day 12. (A) PeGRP2 transcription in roots. (B) PeGRP2 transcription in shoots. (C) PeGRP2 transcription in leaves. The primer sequences for PeGRP2 and the reference gene, PeActin7, are shown in Supplementary Table S1. Data are means ± SD (n = 3), and bars with asterisks indicate significant differences, *: p < 0.05, **: p < 0.01.