Deployment of resistance (R) genes is the most effective control for Hessian fly, Mayetiola destructor (Say); however, deployment of R genes results in an increased frequency of pest genotypes that display virulence to them.
Interestingly, Salmonella cultured in LB-M9 salts media displayed virulence characteristics similar to those observed when only the M9 media was used (Figures 1A and 1C).
Since these mutant strains retained full or partial virulence in the C. elegans model, we decided to construct an hfq deletion mutant given that Hfq has been shown to play a role in the virulence and general fitness of a number of important bacterial pathogens [37], some of which have been shown to display virulence phenotypes in C. elegans.
Brucella displays unique virulence characteristics, as many typical virulence determinants, including type I, II, and III secretion systems and pathogenicity islands, are absent from this bacteria.
These results suggest that ToRSV-AP displays higher virulence and GFLV-F13 displays lower virulence than GFLV-GHu in this panel of Nicotiana species.
Consistent with these findings, ΔrhlR and ΔrhlI mutants have radically different biofilm phenotypes and the ΔrhlI mutant displays full virulence in animals whereas the ΔrhlR mutant is attenuated.
The rom2 mutant displays normal virulence traits but has sensitivity to Congo red, and its avirulent phenotype has been confirmed in a murine model [65], [66].
We further confirmed in separate experiments, and at multiple doses of virus, that the ΔA51R virus displays attenuated virulence compared to VACV-WR.
Except for the bm2 mutant, all other single bm mutants displayed elevated virulence symptoms after U. maydis infection, with bm3 showing the strongest effect.
Enterobacteriaceae that contain the High Pathogenicity Island (HPI), which encodes the siderophore yersiniabactin, display increased virulence.
