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. 2013 Jul 4;4:239. doi: 10.3389/fpls.2013.00239

Figure 1.

Figure 1

Electrical signals measured with the aphid stylet technique in a sieve element after stimulation of the leaf tip at a distance of 10 cm. (A) Stimulation of the tip by water ice triggered an action potential travelling with a speed of 3 cm s−1 in a basipetal direction. (B) Wounding by cutting the tip induced a variation potential propagating basipetally at a speed of 0.5 cm s−1. (Typical signal time courses out of a total of five measurements).