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. 2015 Jan 7;5:766. doi: 10.3389/fpls.2014.00766

Figure 1.

Figure 1

Positions of stimulation, electrical potential, and photosynthetic parameter measurements in pea plants. EL, electrode connected to leaf; ES, electrode connected to stem; and ER, reference electrode; distance between EL and ES, 3–5 cm; and heating of leaf tip (arrow) used as external stimulus.