Fig. 3.

Concentrations of (A) jasmonic acid (JA) and relative expression of gene encoding (B) proteinase inhibitor (PI1) in the two tomato genotypes (CM, spr2) grown under ambient and elevated O₃ levels with and without TYLCV infection after 4 wk. Different lowercase letters indicate significant differences among the four treatments in the same tomato plant, and different uppercase letters indicate significant differences between the two tomato genotypes within the same treatment (Tukey's test: P < 0.05).