Figure 9.

Effects of FA on the leaf temperature of cucumber plants treated with different nitrogen sources: (a) thermal images were taken in the light at 7 h after FA treatment when wilt symptoms occurred in 1 mM NO₃⁻-fed plants; and (b) leaf temperature in cucumber plants after FA treatment. 1AH, 5AH (mock-treated 1 mM or 5 mM NH₄⁺-fed plants, respectively); 1NH, 5NH (mock-treated 1 mM or 5 mM NO₃⁻-fed plants, respectively); 1AF, 5AF (60 ppm FA-treated 1 mM or 5 mM NH₄⁺-fed plants, respectively); 1NF, 5NF (60 ppm FA-treated 1 mM or 5 mM NO₃⁻-fed plants, respectively). The thermographics were performed on the new fully expanded leaf per plant using four replicates per treatment. The data are the means ± SD of four replicates. Significant differences (LSD test, p < 0.05) among treatments are indicated by different letters.