Figure 4.

The prt6 mutation restricted accumulation of Na⁺ in shoots and roots of Arabidopsis plants under salinity. Wild-type (WT) and prt6 plants were grown in Turface under regular growth conditions for 21 d and then irrigated with fertilized water containing 150 mM NaCl for up to 5 d. Shoot and root samples were harvested at the specified time points, washed thoroughly, and subjected to Na⁺ and K⁺ assays. Data represent means ± SE (n = 3). Asterisks indicate significant difference between WT and prt6 (* p < 0.05; ** p < 0.01).