Figure 7.

Population abundance and feeding behavior of B. tabaci when fed on wild-type AC plants treated with H₂O, ABA, 2-DGG, and ABA plus 2-DDG, grown under ambient O₃ (AO₃) and elevated O₃ (EO₃) with and without B. tabaci infestation. (A) Population abundance (number per plant). Each value represents the average (± SE) of four OTCs (12 plants for each genotype per OTC). (B) ‘Nonpenetration' (NP, stylets are outside the plants), (C) ‘pathway' (C, mostly intramural probing activities between mesophyll or parenchyma cells), (D) ‘salivation' (E1, salivary secretion into sieve elements), (E) ‘phloem ingestion' (E2, ingesting the phloem sap), (F) total time to first E2, (G) ‘xylem ingestion' (G, stylet penetration of tracheary elements), and (H) derailed stylets (F, stylets are exhibiting penetration difficulties). Values are the mean (± SE) of 15 biological replicates. Different lowercase letters indicate significant differences between ambient O₃ and elevated O₃ within the same chemical reagent treatment. Different uppercase letters indicate significant differences among different chemical reagent treatments within the same O₃ treatment, as determined by Tukey's multiple range test at P < 0.05.