FIGURE 5.
A principal component analysis evaluating disease assessment and key metabolite features of UV-B (black) and control (white) lettuce (L. sativa) plants of the cv. El Dorado (circle), Iceberg (diamond), and Salinas (square) (n = 9). Plants were treated with photosynthetically active radiation (PAR)+UV-B or PAR only (control) for 3 days. Following treatment, samples were taken for liquid chromatography–mass spectrometry (LC-MS) and the remaining plants were inoculated with 105 conidia mL– 1 B. lactucae. At 12 DPI, plants were also harvested for conidia count.