Fig. 3

Quantification of five phloem-associated metabolites in healthy versus aphid-infested melon plants. Védrantais and its isogenic [Védrantais]^{R_PI 161375} plants were infested for 17 h by NM1 aphid clone -triggering the Vat-mediated resistance- in both experiments, and by either GWD2 aphids -triggering too the Vat-mediated resistance- in experiment (1) or C6 aphids -non-triggering the Vat-mediated resistance in experiment (2). Stachyose, sucrose and galactinol were analysed by GC–MS in melon leaves and expressed as peak area (no units) corrected by leaf sample weight (g). Cucurbitacin B and Glycosylated Cucurbitacin B were analysed by LC–MS and expressed as nMole.mg⁻¹. The number of observations per melon genotype was between 6 and 9. Statistical comparisons were made between infestation conditions for a melon genotype (letter codes indicate significant differences) using a non- parametric bilateral Kruskal–Wallis test at alpha = 0.05