Figure 5.

Average burning-induced changes in the water index (WI) in second (a) and fourth (b) leaves of pea seedlings (n = 5–6). The local burning of the first mature leaf (flame, 3–4 s, approximately 1 cm²) was used for induction of electrical signals and physiological responses (arrow). WI was calculated on basis of intensities of reflected light at 900 (R₉₀₀) and 970 nm (R₉₇₀) which were measured by the spectrometer; changes in WI were calculated as difference between current value of WI and value of WI before burning. Average values and standard errors are shown in the figure. Dotted boxes show significant differences from values before stimulation (p < .05).