Effect of OsHAK5 knockout on salt sensitivity of rice, as indicated by biomass accumulation, K and Na accumulation, and [K]-to-[Na] ratios. Ten-day-old seedlings were grown in IRRI solution containing 1 mm  K for 3 weeks, then transferred to a solution containing additionally 100 mm NaCl and allowed to grow for 8 d. WT(DJ), The wild type of cv DJ; KO(DJ), OsHAK5 knockout mutant line of cv DJ; WT(HY), the wild type of cv HY; KO(HY), OsHAK5 knockout mutant line of cv HY. Error bars indicate se (n = 5 plants). Significant differences from the wild type in each group (DJ or HY) are indicated by different letters (P < 0.05, one-way ANOVA).