Figure 8.

AtHKT1 loss- or gain-of-function affects K⁺/Na⁺ homeostasis in planta. Na⁺ and K⁺ content in the shoot (A) and root (B) of wild-type (gl1), hkt1-4, or gl1 expressing the AtHKT1 transgene (gl1-HKT1:HKT1 line nos. 10-10 and 17-3 in Fig. 6) plants growing in Turface. Plants were grown as in Figure 3. Shoot content values are the mean ± se (n = 3), root content values are the mean ± se (n ≥ 2), and K⁺/Na⁺ was calculated from K⁺ and Na⁺ content.