Figure 4.

Arabidopsis plants expressing HvHAK1 display enhanced Rb⁺ uptake following K⁺ withdrawal. A, Four homozygous HvHAK1-expressing Arabidopsis lines (named J1, B1, A28, and A41) display an enhanced uptake of Rb⁺ from a 100 μm Rb⁺ solution relative to wild-type (WT) plants when deprived of K⁺ for 48 h (on average, n = 7). B, Detailed analysis for the HvHAK1-expressing J1 line. Results are means of 13 experiments (each one consisting of seven independent replicates, on average). Error bars represent se. Different letters indicate significantly different values (P < 0.05 for A, P < 0.01 for B).