Figure 11.

Effects of exogenous application of melatonin, SA, and tJA on the endogenous contents of melatonin, SA, and tJA of Ca. L. asiaticus-infected Valencia sweet orange trees using targeted GC-MS-SIM. Citrus plants were treated with 200 mL of Milli-Q water (control), melatonin (0.1 mm), SA (0.1 mm), or tJA (0.1 mm) through foliar application. A, C, and E, Representative chromatograms of melatonin (A), SA (C), and tJA (E) at zero time and at 72 hpt. RT, Retention time. B, D, and F, Endogenous content of melatonin (pg g⁻¹ fresh weight; n = 6), SA (ng g⁻¹ fresh weight; n = 6), and tJA (ng g⁻¹ fresh weight; n = 6), respectively, from Ca. L. asiaticus-infected Valencia sweet orange trees at zero time and at 72 hpt. Whiskers indicate the minimum and maximum values of the data, horizontal thick lines show the medians, black dots indicate the raw data, and boxes show the interquartile ranges (25th to 75th percentiles of the data). Different letters indicate statistically significant differences among varieties, while the same letter signifies no significant differences between them using Tukey’s HSD (P < 0.05). FW, Fresh weight.