Figure 6.

Effect of CIPK23 and BLUS1 mutations on blue light‐induced activation of K⁺ _in currents in guard cell protoplasts.

(a) Effect of blue light on voltage‐dependent K⁺ _in currents in GCPs from wild‐type (Col), cipk23‐5, and blus1‐3 plants. Whole‐cell K⁺ _in currents (pA) were measured 2 and 5 min after the pulse of blue light (100 μmol m⁻² sec⁻¹, 30 sec). Measurements were performed under dim red light (0.2 μmol m⁻² sec⁻¹) as a control.

(b–d) The relationship between the whole‐cell inward‐rectifying K⁺ currents (pA pAF⁻¹) and the membrane potential (mV) in GCPs from wild‐type (Col) (b), cipk23‐5 (c), and blus1‐3 (d) plants. Each value is the mean current from six or eight independent experiments, and the error bars denote SE.