Figure 2.

High-Affinity K⁺ Uptake Is Enhanced in arf2 Mutants.

The K⁺ content (A) and ⁸⁶Rb⁺ uptake rate (B) of the wild type, arf2 mutants, and complementation lines. Data are means ± se (n = 3). Student’s t test (**P < 0.01) was used to analyze statistical significance, and “#” represents control.

(A) Seedlings were germinated and grown on low-K⁺ medium or K⁺-sufficient medium for 7 d.

(B) Seven-day-old seedlings were starved of K⁺ for 3 d. Then, ⁸⁶Rb⁺ uptake rates were measured at the indicated times (0.5 and 1 h).