Figure 3.

Expression of HvHAK1 is transiently enhanced by salinization and parallels changes in the reduction of Na⁺-inhibitory effects on Rb⁺ uptake in barley roots. Plants were exposed to 100 mm NaCl in the presence of 1 mm KCl. A, Accumulation of HvHAK1 transcripts measured at 0, 6, and 48 h since the beginning of salt stress (n = 5). B, Rb⁺ uptake from a 100 μm Rb⁺ solution, after those periods, was measured in both the presence and the absence of 100 mm NaCl, and the quotient between the uptake measured in those conditions is shown (n = 6). Error bars represent se. Different letters indicate significantly different values (P < 0.005 for A, P < 0.05 for B).