Figure 4.

ROC3 is involved in the ABA-induced activation of anion channels in guard cells. (A) Patch-clamp whole cell recordings of S-type anion currents present in guard cell protoplasts isolated from WT, roc3 mutants and the C-1 and C-2 complementation lines, incubated in the presence/absence of 50 μM ABA. (B) Average current-voltage relationships of whole cell S-type anion currents. The number of guard cells measured were: WT (5), WT+ABA (6), roc3-1 (4), roc3-1+ABA (6), roc3-2 (5), roc3-2+ABA (6), C-1 (4), C-1+ABA (6), C-2 (4), C-2+ABA (5). Values shown in the form mean ± SE.