Fig. 2.

Apoplastic pH of barley leaves responding to 10 μm FC or to 5 mm NaCN + 0·2 mm salicylic hydroxamic acid (SHAM). Agents were added to the leaf according to Fig. 1B and reached the measuring site after being carried through the xylem stream, as described in Felle et al., (2000). The curves are representative of three experiments (FC) or four experiments (NaCN/SHAM).