Fig. 8.

Effect of low pH and combined low pH/Al treatments imposed at time=0 on the plasma membrane potential in the distal elongation zone of 4- to 5-day-old Arabidopsis thaliana roots. Error bars indicate ±SE (n=8–10 seedlings). The horizontal dotted lines represent the resting plasma membrane potential of the respective genotypes at pH 5.5. Arabidopsis seedlings were conditioned in basal salt medium (BSM; 0.1 mM CaCl₂+1 mM KCl+0.2 mM MgCl₂, pH 5.5) for 20 min before treatments were imposed in unbuffered BSM.