Figure 11.

Na⁺ flux of the root xylem and the response to an osmotic jump in the wild-type and PtEXPA6-overexpressing lines of 84K and 717-1B4. After exposure to 200 mM NaCl for 4 h, the intact root tips of the PtEXPA6-trangenic lines of 84K (L11, L12, and L13) and 717-1B4 (L9, L15, and L16), and wild-type (WT) were exposed to 300 mOsmol kg⁻¹ mannitol (−0.75 MPa), followed by a 0.1 MPa osmotic jump. The net Na⁺ flux of the root xylem was measured before and after the addition of mannitol and the subsequent 0.1 MPa osmotic jump. The data are means ± SD (n = 3), and the bars with different letters indicate significant differences (p < 0.05).