Table 1.
Identification of compounds in the root volatile profile.
Figure 1.
Scanning electron microscopy images of inoculated and non-inoculated corn roots.
Scanning electron microscopy images showing the colonization of corn roots by the plant-beneficial rhizobacterium Azospirillum brasilense. (A) Inoculated corn roots and (B) non-inoculated corn roots.
Figure 2.
Effect of Azospirillum brasilense on Diabrotica speciosa larval host choice.
Diabrotica speciosa larval choice between inoculated plants and the blank treatment (non-inoculated soil), inoculated and non-inoculated corn, and the plant-beneficial rhizobacterium (PBR) inoculant and the blank. Bars represent the mean number of larvae ± SE. Pie charts on the right represent non-responsive (no choice) and responsive (choice) larvae. Asterisks indicate a significant difference between treatments according to a quasi-Poisson glm (n = 10, P<0.05).
Figure 3.
Root volatile profile induced by Azospirillum brasilense colonization.
Emissions of volatile compounds from inoculated and non-inoculated corn roots. Bars represent the mean ± SE. Different letters indicate a significant difference between treatments according to One-Way ANOVA followed by Tukey’s HSD test (n = 4, P<0.05).
Figure 4.
Effect of Azospirillum brasilense on Diabrotica speciosa performance.
Diabrotica speciosa larval performance when fed on inoculated and non-inoculated corn plants. Bars represent the mean larval weight ± SE. Asterisks indicate a significant difference between treatments according to according to a glmm (n = 10, P<0.05).