Figure 8

Effect of JA-induced B. rapa defense response on thrips population. (A) Water (control) or 10, 100, or 1000 μM JA was applied to 2-week-old B. rapa plants 1 day before thrips were introduced. One adult female fed on each leaf disc for 4 days. Eggs were stained with trypan blue. Mean ± SD of eggs per leaf disc based on 10 independent determinations. Different letters indicate statistically significant differences between treatments (Tukey-Kramer HSD test; p < 0.05). (B, C) Twenty adult females fed on 2-week-old WT plants for 2 weeks. Water (control) or 50 μM JA was applied 1 day before thrips were introduced. After 2 weeks, adults (B) and larvae (C) were counted. Mean ± SD based on five independent determinations. Asterisks indicate significant differences (Student's t-test), *p < 0.05, ***p < 0.001.