Figure 3.

Changes in photosynthesis activity induced by variation potential (VP) in the first, second and third leaves, located below the stimulated leaf: (A) the typical records of non-photochemical quenching (NPQ) changes in the first, second and third leaves; (B) amplitudes of NPQ changes in the first, second and third leaves; (C) the typical records of Φ_PSII changes in the first, second and third leaves; (D) amplitudes of Φ_PSII changes in the first, second and third leaves; (E) correlations between the amplitude of the photosynthesis response and the VP amplitude. Correlations were determined for simultaneous recording of electrical signals and photosynthesis responses on separate plants (n = 8). Different uppercase letters denote significant differences between columns of fast phase, different lowercase letters denote significant differences between columns of long-term phase, p < 0.05.