FIGURE 5.

Local far‐red illumination on Leaf 4 increases soluble sugar content and lesion development in both Leaf 4 and Leaf 3. Schematic overview of the local FR illumination procedure on Leaf 3 (L3 in a) and on Leaf 4 (L4 in d). Experiments were carried out on the illuminated leaflet (local) or a leaflet located on another leaf (distal). Three‐week‐old tomato plants were illuminated for 5 days with local FR (FR) or exposed to white light (WL) as a control. Soluble sugar quantifications including the glucose, fructose and sucrose fractions (b and e) as well as lesion area measurement on L3 and L4 after inoculation with Botrytis cinerea spores were performed at midday on Day 5 (c and f). Data show mean ± SEM and different letters represent significant differences (ANOVA with Tukey's post‐hoc test, p < .05), n = 7–14 plants per treatment