Figure 6.

Content of stress-associated phytohormones. Changes in the concentration levels of endogenous (a) abscisic acid (ABA), (b) jasmonic acid (JA), and (c) salicylic acid (SA) in leaf samples taken from ‘Nebbiolo’ and ‘Moscato’ plants artificially inoculated with Erysiphe necator and then untreated (CTR) or treated with acibenzolar-S-methyl (AcS-Mt), potassium phosphonate (K-Pho), and laminarin (Lam); n.d. not detected. Significance of genotype, treatment, and genotype × treatment (G × T) interaction was assessed by Tukey’s HSD test for p ≤ 0.05 (*), p ≤ 0.01 (**), p ≤ 0.001 (***), and p ≤ 0.0001 (****) and the corresponding results are given above each graph in the figure panel; n.s. = not significant. Lower case letters above bars are reported when the G × T interaction and/or genotype (G) main effects are statistically significant as attested by Tukey’s HSD or Student’s t-test, respectively. Error bars represent SE (n = 3).