Figure 3.

Systemic apoplastic voltage transients (SPs), generated by different inorganic cations, added to a cut-wounded leaf (S-leaf) and monitored on the T-leaf. A, Response of H. vulgare to 100 mm Na⁺, Mg²⁺, K⁺, or Ca²⁺. B and C, Responses of H. vulgare and V. faba, respectively, to different Ca²⁺ concentrations, as indicated. For all panels, one experimental set each of three equivalent tests is represented.